I found a couple of problems, games that don't work properly or at all (posted in separate threads) after the update.
Overall ICS isn't such a big improvement for A200 owners since we already had the jump to app from the unlock screen, screenshot, and the 'Acer ring', so the changes are mainly cosmetic.
I like the slide to cancel notifications, but it is not a world changer. To be honest, if it was easy to roll back to 3.2 I probably would, but that's just me.
Going with the idea that if it ain't broke don't fix it, I cancelled auto updates on most of my apps.
I also didn't have a problem with the Android Market, but now I guess I'll have to learn to like Google Play