the xb-e is lighter, and since brushless motors have crazy torque...will out accelerate the gas xb's.
brushless is really nice. and a second pair of 3s 5000mah lipos could be bought for $60-$70 on hobbyking.com. that would get some pretty good runtimes.

but yes, the gassers do get awsome runtime. most get 1/2 to 3/4 and hour per tank! but they are VERY LOUD!!!. oh, and did i mention they are WICKED LOUD! think high-pitched chain saws running WOT!
its part of why they are soo cool. but there are times i would like to run my king motors baja that i cant. i dont run it on the street i live on, since my neighbors are old and would complain. but the xb-e would be quiet enough.
i have to take my baja to fields, or large parks when no-one is around.