Got a set of 53mm Classics in the NEW 97a formula today. Hopefully get to give them a spin tomorrow. Will report back.
Reporting back. I really liked these. A tad softer than 99a, with tad more grip, but still have good rebound (which is usually lost with softer wheels, and is an essential element of a good wheel). A tad more effort to slide, just a tad. They are also a tad slower than my 99a, and that was actually their undoing for me.
I've had bouts of Achilles tendonitis for years (pushing foot). In 2018 I had it real bad and was off the board for quite a while. I've learned how to manage it, but it flares up from time to time. Recently it's been bothering me a bit. The 97a were often requiring that "one extra push" when setting up for something, or even just rolling around. I need to be doing less pushing, not more. So, the 99a went back on. Might move up to 101 on really smooth stuff.
What I haven't done it yet, the next thing is to compare the 97a and 93a on some more crusty stuff. That will be a future post.
Overall, aside from the very personal issue with these, I found them a lot better than the old 97a formula, and would certainly recommend them to anyone who (a) doesn't have pushing-foot Achilles tendonitis, and (b) wants to try something a tad softer.