I got a Blackberry 8700g unit yesterday and here are my initial impressions after 24 hours.  This is the TMobile EDGE equipped handheld.  The screen is very nice, the backlighting works very nicely in all lighting conditions, including outdoor sunlight - much better than the 7100t I had previously.  The EDGE network speed in my web surfing and download 3rd party apps has been much quicker than the 7100t, I dowloaded the Idokorro MobileAdmin program in a few seconds yesterday while waiting at Jury duty. I really like the type-ahead addressing when creating a new email message, I believe this is new with the 4.1 handheld software. Phone call clarity is very good, both normal mode and speakerphone.  The speakerphone on the 7100t was also something I thought worked well.  I haven't tried the Bluetooth on my phone, but a my boss didn't care for it when used with his car's Bluetooth kit, but another colleague sounded fine when he called me with his Bluetooth headset on his 8700g, so YMMV.

On the other side, the keyboard seems smaller, but I've been working with the 7100t keyboard, so it's fine for me, I'm just trying to relearn where the return and delete keys are.  The keys can feel slippery at times, but I'm guessing that will get better over time.

Overall, I'm happy with the unit, and look forward to using it with the 4.1 server and Sametime in the near future!