Just read an article from pc mag that had some relevancy.
from pc mag:
"Since the BlackBerry e-mail system is optimized for slower networks, the fast EV-DO network doesn't shine quite as brightly when you're using the BlackBerry as a handheld. The system just doesn't transmit enough data for EV-DO's speed to become important. E-mails arrived at the same speed as on a T-Mobile BlackBerry 7105t, which uses the much slower GPRS network. As the BlackBerry Internet Service boils most attachments down to formatted text, we didn't see much of an advantage there, either, though scrolling down through attachments was noticeably snappier on the 7130e than on the 7105t.
Web browsing was definitely faster with EV-DO than with T-Mobile's GPRS network, but not by the tenfold difference we'd expect from sheer throughput speeds; pages like www.expedia.com
downloaded and displayed two to three times as quickly on the 7130e as on the 7105t. Perhaps processor speed is the limiting factor; the 7130e didn't do any better on JBenchmark Java benchmark tests than its predecessors did."