+1 to that.
I had my DX on 2.1 for a week before the OTA became available - it was pretty good then, but once I completed the OTA all I saw was an overall improvement in speed, smoothness and functionality (I have had the batt mgr FC on me a couple times, but that's not a big deal to me). I also ran Quadrant before and after the OTA and saw an improvement of about 200 in the score after Froyo. No slowdowns or any similar degrading as posted above on my DX since the upgrade.
I'm wondering if there may still be a few bad phones out there that just didn't handle the OTA well. Some people (first adopters?) have posted in other threads that they had to swap out their phones once - or more - to fix problems they had.
It might also be interesting to hear what the Quadrant scores are for those who have the issues reported above. I would guess that their scores might be on the low side, which might be indicative of a hardware problem? I was seeing about 1230 on 2.1 and then low to mid 1400 after Froyo. Anyone with the above problems run Quadrant and what were the results?
EDIT: I also wanted to add that I've seen a MAJOR increase in battery life since the 2.2 update. I'm now over two and a half days since fully charged and battery is at 40%. Since I took it off the charger I've used it as a movie player, ipod, and phone besides surfing the web. I wasn't even seeing a full 24 hours before on 2.1 - amazing!