The security concerns are basically BS, as it's not the -profile- that's disabled, it's the access. This also applies to using a data cable.

EV-DO claims speeds up to 3mbit or so, Bluetooth supports speeds up to about 1.1mbit. That much is true.

Verizon has a separate, nontransparent proxy service they use called Venturi. I actually enjoy using it --- it makes things noticeably faster on image-heavy pages, and I'm usually crunched for time when I'm on EVDO.

Verizon's service goes into 'DORMANT' mode after a minute or so, at least on all the Motorola phones I've used. It seems to save battery life more than anything else, although there is a lag in re-establishing connection.