Those type of streaming data and non-BIS data apps were and have been the cause of loss of EDGE all along. I had a Pandora developer explain this to me (in much more technical terms) at WES 2009.
While the Storm 1 and 2 will work with Tmobile and AT&T, it does require caution and care.
If you really want a Storm2, remember there ARE two models. Get the 9520.