I think it's fantastic that we may finally have a true competitor to HTC in the Windows Mobile space.
Most of these devices are Tri-Band 3.5G, so they'll function on AT&T in the US, something HTC has certainly been ignoring lately. -- Touch HD, no US 3G bands - Touch Diamond2 - no US 3G bands, but rumored to be coming, let's see... Touch Diamond Pro2 - TMobile or Asia/Europe only. HTC has stuck us with tiny 2.8" VGA screens, meaning for all intents & purposes if you wanted a decent sized, hi-rez screen with 3G in the US you had to go with an iPhone or Blackberry.
I can't wait to try one of the higher end Acer devices.