Much to my dismay, the AT&T card was just downright slow. I'm not in a rural area - I'm about an hour from Philadelphia and cell phone coverage is excellent in my area. However, the ATT broadband card gave me download speeds similar to a 28.8 modem! I even tried it in several locations, even the pages that contain the speed tests were loading at a snail's pace. The AT&T card barely moved the needle on the speedtest gauge!
After a few days, I went down to the Verizon Wireless store nearby (also one of my clients) to see what was available. Not only did they sell me an Express card with no mail-in-rebate (AT&T was $150 before the mail-in rebate), but it was free. Still sitting at their counter, I installed the VZaccess software and I was up and running in a matter of minutes. Then, the speed test: Verizon's card was EASILY more than double the speed of AT&T!
Guess which card got returned? :-P