For starters, I longer use this phone for business. From what I hear At&t has good coverage in Houston but the Iphone phone has some serious issues in my opinion. I was and still am a Verizon customer and will continue to use my Blackberry and Treo with verizon in addition to my Iphone which is now my personal cell phone. 3G coverage from att is spotty at best. I drop a lot of calls and get call failure when I try to dial out.
As for the software update it seems to not be as glitchy but the devise does still slow down a bit between reboots. Switching between program is not quite as bad but sms is still slow to open and I still get the occational freeze here and there.