Yep, after using it this weekend, I gotta say that I am absolutely LOVING THIS!
With Mango, I feel like I
*almost* have everything I want... all I need is a full-featured Remote Desktop app (gotta support Network Level Authentication, SSL encryption, and RDP Gateways), SWYPE, and Visual Voicemail. I figure SWYPE is still the least-likely to happen anytime soon, but I do like the WP7 keyboard. I also have the Arrive, so having a slide-keyboard is nice, although I have yet to use it. None of these are showstoppers to me, though, and frankly it's the experience of using the platform that impresses me most. It's fast, it's simple, and it's efficient... exactly what I was lacking from Android.
Honestly, my biggest hangup so far is that I want the HD7 instead of the Arrive just for the form-factor.