Nothing that complex. I don't know how much stats are locked down for basic members so I can't be really clear but most of the stats are things like W/L/D, breakdown by color, best win, average opponent (also average when you win, lose, draw). A few other ones but nothing too complex.
it would be awesome if they indexed Opening Explorer for each players games. So I could see how badly I get trounced by the kings indian in blitz or whatever.
You can switch to your games in the Opening Explorer. Don't know how deep it goes for basic members or if it fully works. 
I use a local database for most of that myself.
Dude! Crazy! I've never see the "My Games" in opening explorer (is that new to v3)? That's some serious hotness. Thanks for the tip.
Well, I believe it is available on v2 also but games weren't populating correctly. Actually, if you go back to v2, I think you'll see them there now too.
so it only allows you to browse like 4-5 moves in without having a subscription, which is fine. It also doesn't have the complete set of games, for example there are only about 2K blitz games loaded for me, but I have like 5K games that I've actually played. It's actually fine if it's not all the games, but it would be nice to know what they're showing there (like last 1 year, or whatever).
Does premium membership unlock more personal stat features? For example, personal win/loss/draw percentage from a certain position?