I'm having issues finding a replacement for these. I'm down to my last 2 and they are getting pretty worn out. I know common sense says stick with these but they are hard to find and getting too expensive to replace the grommets. I used ps 6.1 hyper for a few months. I liked having a bit more power but the control wasn't there like the old sticks and my tennis elbow flared up. I switched back to my 6.6's after that and everything was fine. The Prince EXO Ignite felt the most natural to switch to but it still wasn't quite there. I'll probably end up playing with this a few more times. I didn't find anything in the current Wilson line that felt like a natural switch. Fed's racket didn't agree with me, the rest of the 6.1 line wasn't quite there. I see they have a Sampras model out but I have not played with it yet. Hopefully I'll get to do that this weekend. Has anyone else who has played with the 6.6's for a long time found something that worked for them when they switched? I'd like to find a stick that feels like it's a natural switch.