I had the Digicue Blue for a few days.
Prior to that, I bought the original Digicue last year.
The Blue is the same form factor. It fits onto the end of your cue, and stays put. Removing it does not damage the finish. It does add noticeable weight to the cue. However, it does not affect play. I was able to adjust to the added weight in about 30 seconds
It also adds an inch or so to the butt length, and it came in handy sometimes for a longer reach.
I initially had connection issues to my phone. There was a bug in the app, and the developers were able to fix it. Once that bug was fixed, I had no further connectivity problems.
The developers did not send us instruction on the app, on purpose, to see if we could figure it out. It was fairly easy to use, and intuitive. There were a few things that were a bit harder to use than they should be. For example, you can see a broad overview of your shot history, and then click on one individual shot to dig deeper and get more info for that one shot. Once inside the shot, if you want to get that same level of detail for another shot, you have to go out one menu level, then select another shot. This was cumbersome if you wanted to see 10 shots in detail, for example. I suggested to the developers that once you are in the detail of a shot, to be able to simply swipe right or left to get to the shot after/before.
Overall, I'd say the user interface is a 7 out of 10.
The main point of the device, is to measure any stroke flaws you have, and notify you both with a vibration on your cue stick, and with bar graphs on the phone. The vibration on the device indicates a flaw, but not what the flaw was. The bar graphs on the phone, show each stroke error, and how well or how poorly you did on each one.
I will say, there is a definite lag between when the shot is struck, and when the phone registers it. I'd say its about 4 to 5 seconds. Not a huge deal, but if you want to shoot, and evaluate immediately after every shot, lets say 10 shots in a row, that lag will definitely slow you down.
Besides the lag between the hardware and the phone, there are also times when the phone never registers a shot at all. I tried to fool it, by shooting 10 object balls in the pocket directly (without using a cue ball), with about 2 total seconds between each shot. The phone only picked up 5 of them. Slowing way down, with about 8 seconds in between each shot, the phone got all or most of them. I imagine this missing of the shots will get better over time. I don't know if that can be improve with software updates, or better hardware, or both. Time will tell. I found over time, it missed about 25% of the shots I took, just playing racks normally, and not trying to fool it. Even though it missed those shots, there was still plenty of shots it did pick up, and plenty of data for the shooter to analyze.
The feedback on the app is bar graphs. The better you are at a particular stroke attribute, the longer the graph. When you have the setting at beginner, you can have larger stroke flaws, before making the unit buzz. When set to advanced, your stroke has to be better. You can see where the cutoff is on the bar graphs, it shows a little line that you have to be above, in order not to vibrate.
There were 9 things it measures:
Finish (used to be called freeze)
Finesse
Straightness
Tip steer left
Tip steer right
Follow through
Jab
Backstoke pause
Shot interval
To be honest, I didn't know what finesse, follow through, and jab did. I tried a bunch of hokey strokes, and couldn't figure out exactly what made them buzz, and what made them keep quiet.
What I did discover, is that "Straightness" I could not get a good score on at all, even when everything else was perfect. I could do the drill with the cue going up and down the table and hitting the tip, and it would show a fault. I even dug out my aluminum stroke trainer that guides your wrist, and it still faulted. Many of my strokes naturally finish with my tip on the table. I had an aha moment, and tried more of a piston stroke, trying to keep the tip moving in a straight line, instead of a downward arc. That finally showed improvement on the "Straightness"
The developers informed me that "straightness" measures any deviation of your stroke from a perfectly straight "laser beam". Where as Tip Steer Left/Right is the same, but ignores any vertical deviations from that laser beam.
[As an aside, I bought the original DigiCue last year, and I could never get it to stay quiet, even on beginner mode. Now I know why. It was because of the dip in my stroke. IMO, the original one should maybe be changed to not be so sensitive on the downward dip at the end of the stroke. If you have an original one, and can't keep it quiet, try more of an elbow drop piston style stroke, and see if your results improve.]
The best part about this product, IMO, is you can turn on or turn off only the things you want to work on. After using it for a few days, I settled on turning off all of the measurements, except for Tip Steer, which I set on the most advanced setting.
Another thing I did after a few days of using it, is not even have the phone app on, and only have the device on my cue (in the custom setting I wanted, which was only for Tip Steer. I simply played my normal ghost practice, and tried to keep it quiet. I think a lot of people might end up using it like that, after they fool around with the phone app part of it for a few days. You can use the device completely standalone, and not even have your phone turned on, if you wish. It will remember the last settings you used, for what it is looking to measure.
The battery was good also. I used it for 5 or so days, and didn't have any battery dying issues.
Will this make you a better player? Maybe, maybe not. It does help you focus more, to keep it quiet. But its like any other practice aid in our game. You have to put in the work.
I'd give the overall product a B-. I think it is ready for prime time. But I also think future models will be better as the technology improves.
I would not get the original DigiCue at all, now that this is available. This is at a higher price point, but I think the ability to turn on and turn off what it measures, and show you the results, is very much worth the extra cost.