Caps? U-verse doesn't have caps/overage charges, although there is a mention of a 250gb limit, it is not enforced. Many users report going over this limit on a monthly basis, including myself with no warnings/charges. Apparently they don't have an accurate way to track usage, and this is even mentioned if you try to look at your usage on AT&T's website.
So I am not quite sure why you would jump ship for that reason alone.
San Francisco, CA
AT&T = "Attempting" to implement caps, but doesn't have the competence to do it.
Sonic.net = NO CAPs AT ALL AND NO PLANS AT ALL to implement caps.
So, yeah, I jumped ship for that reason alone.
And once again, the fact that they "thought" about implementing it is idiotic. I'm making a statement with my wallet.