I've been pretty pleased with the update.
I was unable to use the OTA due to changes that I had made (and didn't save) to my configuration which prevented the update from running. Doing things differently this time round.
S-OFF made getting back root a breeze once I figured out what to do.
Browser lag was easily understood as being all the extra flash on pages... Changed Plugin to On Demand and that went away.
Never cared much about 720p.. just don't do videos on my phone and if I did, still would not care. I rarely use the camera (set to 1mb instead of 8mb).
Since I had to clear my data to use the Froyo RUU, I kinda of started off clean, but did use my Titanium backup to restore a number of apps and their data that I could not easily remember or locate after I got back up in running.
Moved (instead of deleted) a number of bloatware apps, Amazon MP3, CityID, Skype, FM and some others to a oldapp directory on the phone to rid myself of them auto starting. Very annoying.. Never use Peep.
and Yes, I do you an app killer, but only for manually killing apps. Most are ignored, but somethings like Camera, Barcode I want off as they continue to use power when they are running.
Battery appears to be better than before, and will most likely get even better as I stop playing around with the phone so much. Like any new toy, I am using it a lot more than I normally do as I check on stuff, configure and explore.
As of now, I pretty much have everything I had before up and working including Swype, HTC-IME keyboards, the layout like I like it, contacts, Touchdown etc... and finally sounds. Did a new Nandroid backup and I should be doing regular Titanium backups starting this weekend again.
Overall, I quite pleased with the update.