I have a Dell and a happy VZW customer. I tried the REV. A card that is on the motherboard of my Studio 17". With 5GB cap you cant do much. I went to just normal sites like ESPN and watch my data go to 100MB in a short time. With a 20GB cap I might be interested.
I'd consider it - if I were to cut TV/Phone service completely, and I could get at least a 10GB cap before the exponential price hikes.
Currently, I end up paying $100/month (after taxes) for TV, Phone and Internet (10Mbps/1Mbps), so it isn't attractive. Also, work pays for my unlimited Treo 800w on Sprint, and I have a 28% discount on service for AT&T mobility on my HTC tilt (set data service to PPU / use WiFi with MoDaCo NoDATA)