I've installed the PRO tips on both my son and I's cues. We've been using them for about 2 months.
I really like the hit on them. They install very easily. I've noticed some issues with them though.
Chalk. When I bought my table, it came with a bunch of silver cup chalk. Silver cup chalk just doesn't want to stick to this tip for me. I've scuffed the tip, used the tip pik on it, and have sanded it. I just couldn't get it to stick. Once I started using Masters chalk, that problem went away.
Mushrooming. After installing the tip, I've had to address mushrooming twice. Both of which we able to get flush again by simply wetting it, and taking a piece of leather to it. I'm used to my tip having a shine to it, and no matter how hard I try, it just doesn't seem possible with this tip. To get around that, a nice layer of sharpie does the trick.
Overall, I really like the PRO tips because of their performance and pricing. Sometime soon, I'd like to try out the hard tip. I had a white diamond tip installed on my break cue, and it's popped off.