My experience with the OB-1 so far is that it takes a lot of adjustment to get used to it. A lot of this is due to the fact that I am much more of a feel player than I thought. Now that I am playing with the OB-1 I have found that the adjustments that I made subconsciously for deflection have been a problem because now those adjustments do not need to be made. For example, With my original shaft I can use inside spin with ease, but now I have to make an effort with the OB-1 to stop and remember that I do not need to make my normal adjustment. It's gotten to the point now where I know I am still compensating and once I make this realization I can force myself see the correct contact point.
I believe that this is a situation where my brain has been translating all of these variables and making an adjustment to what I see as the contact point on the object ball in much the same way that everyones brain inverts everything they see so that it does not appear upside-down (Here is a better description of this phenomenon:
http://www.physlink.com/Education/AskExperts/ae353.cfm).
In the end this means that if you have been playing for a long time expect to have to go through a reprogramming phase for your brain, but in the end it should be worth it.
In addition, the shaft also has a much smaller diameter than I expected. I think this may be why I have been miscuing with it on draw shots as I do not need to go as low with it as I do on larger diameter shafts. This may also be the cause for the increased swerve that I have noticed as I do not need to go as far to the side to get the same amount of spin that causes this effect. I think this is actually an improvement for me because I always had a problem with using swerve to get around an interfering ball with accuracy and now I can. I am also able to get a lot more spin off the rails with a much lighter hit which I find to be beneficial as I believe that a softer hit is more accurate.
The shaft is also much lighter than my original. This makes sense as the shaft is cored with some sort of spongy light-weight material. This has caused the balance point of the shaft to go back a bit and has actually been beneficial as I recently changed my stroke to a much longer one and moved my grip further back anyways. On the down side, I have noticed that I need to actually hit a shot harder when trying to do a controlled draw stroke of about an inch or two from distance. I assume that this is because the lighter weight of the shaft doesn't transfer as much momentum into the cue ball so it loses its spin faster, but that is a question for the experts not me.
Just my thoughts about this interesting portion of my journey...