I’ve had great results using bearings with 8 and 10 balls. I find the quality of the bearing itself is more important than the number of balls.
All 4 of my DM2’s are using 8-ball steel wing cut Terrapin X bearings. I’ve also notice nearly all of my YYJ Speed bearings are 10 ball ones.
I will say, not to knock YYF products, but I have had a lot of problems with their SPEC bearings. I’m not alone, many others have mentioned the same thing. That’s not to say they are all bad, as I do have a few really good ones. I do have more than I would care to mention in my little storage box of “bad” bearings though. These I’m saving for tweaking projects to see if I can “restore” these, among others.
Then, on the flip-side, the CenterTrac bearing so far has never given me any problems at all. It’s not my favorite bearing. I have found that for the yoyos that it has shipped stock in, it has in fact been the best bearing in that particular yoyo. I wouldn’t mind having a few more.
I am willing to sink some dollars into the SPEC-X bearing and the new upcoming CTX bearing. I’d want to get at least 2 of each. I think I will be correct in my assumption that the SPEC-X will address and resolve the problems of the SPEC bearing, and that the CTX will just be a better CenterTrac.
I haven’t noticed any difference between the YYF ones in yoyos, the ones sold in the little CBC envelopes and the ones in my CLYW"s and my Positron.