HD2 is a winmo, and to be honest, typing isnt the best with the standard keyboard.
There are keyboard apps out there for it, but I dont use my phone alot, so Im not bothered.
I'll be moving on from the HD2 when Nokia release the E5. But for my first touchscreen experience, it is nice to be able to scroll menus and flick through pics using the screen; but it needs to be tweaked to be able to use without accidently clicking icons you don't want.

As dc said, if you use BBM you'll be disappointed not to have it, as you'll have to SMS.

If you want an android, Id suggest the HTC desire over the motorola due to the larger size (if you can get it).