Here are the changes I notice.
a) Voice to text. 10% of the time I would hit the microphone button on the keyboard, speak, and nothing would register. I'd have to start speaking again for it to register sound, and whatever I said while it wasn't registering sound would come out as gibberish.
Now this happens 50% of the time.
b) In the calendar, when I hit menu on an event, I don't see "edit event" as an option anymore. I tried to change the time of an event when someone called me, and could not figure out until after I hung up that I have to hold my finger down on an event for 2 seconds, then hit edit event.
Making the interface less intuitive is lame.
c) HTC mail still can't send mail over wifi. I like how I can select text from within an email the same way I can within the browser, but having to turn wifi on and off everytime I send an email is lame. I expect some bugs when the device comes out, but this was a chance to fix all that.
My personal favorite,
d) The phone was acting weird(think storm 9530 before OS5), so I turned it off, removed the battery, and turned it back on. I turn it back on to find out all the phone contacts are gone, 99% of the 3rd party apps I installed have icons but won't start/have their data cleared.
For all the supposed updates, I was hoping at the very least I'd be able to select text in applications like K-9, maildroid. Or on apps that came as a part of the phone - gtalk. If someone gtalks me a tracking number, I have to retype it then select what I just typed. This is asinine.
The phone seems no faster than before. The speed is the same. I's just buggier and less intuitive.
I use the phone for business, primarily to set appointments, take customer calls, order parts, do banking, check the status of orders. I loved it coming from a storm, I still do, but wish 2.2 were actually an upgrade.