I can tell you that on the 28008 build, the GPS works great! google maps and sprint nav work flawlessly.
I can also tell you that after doing the usual sms/mms dance that works great as well. It does send with the usual -GSM attached to it. run the CDMA settings cab and you should be back in business.
I just assigned messaging to one of the quick launch spots on the home tab.
Hope this helps!