I have been using Touchdown now for about a week, much much better than the native app for sure.. I was severly disapointed in the native app to say the least. Exchange support even on my ipod Touch was better.
Touchdown will sync email, contacts, calendar and yes Tasks!.. Notes is not supported. It claims to support Out of Office, with Exchange 2007.. Unfortunatly i have 2003! The trial version is actually 30 days now.. I'll be forking over the $20 bucks in a few more days..
You don't have display problems with touchdown?
I found the app useless since I could not read the messages. The longer the message, the worse it got.
I sent an email to them and never got a response. They included:
o Wide messages text flows off the screen to the right and does not
appear to be reachable by any method that I've tried. Flipping the phone to landscape is even worse. The line that is too long turns into a series of broken graphics with no way to read it at all.
o Viewing long messages get blanked out as you scroll down to the point
where you can't see the message at all.
o Viewing contact that have any size able notes is very hard as the system
scrolls to the bottom of the note when you get near it.
o Editing contacts, sometimes provides nothing but blank fields.
o Many time search gives you the box, but you can't get the keyboard to
show up. You need to stop and try it again sometimes several times before
you can get the keyboard.