Yeah the ground resistance is an unknown (unless i missed it on one of the sites) but given it's only 12t i hope it won't be anything crazy like the CDC. Unless wg screw it over that is. It should be quicker anywhere than a prog (and any other med) - whether that makes any difference of course is basically going to be fringe cases.
From a vision perspective (yay for the rare occasion you get to use it) it looks to have better on the move camo than any other 8 med and is only shaded by the 416 for stationary (but i haven't put a crew in it so that's just extrapolating from the figures TAP posted). And 390 VR is near top of class, esp considering all the 400m meds have shitty camo. Again of marginal benefit, but it's still a leader.
Burst and dpm wise it's again up there. You're basically doing a full prog clip in half the time, then if the prog fired 3, he'll have 480 at the ready while you'll have 720. The only things that beat it from a dpm perspective are the sta 1 and 416 (<-speaking of awkward...). Things like the lorry can out burst it but have to then deal with a much longer reload - hence the considerably lower dpm.
And yeah, then there are all the shitty things... pen, accuracy, aim time (tho we don't know dispersion which will be a make or break basically), HE pennable armor, and probably a shit radio too ;).
Hence the whole 'divisive' line. Imo it will be an interesting option, not as reliable as the lorry and prog, but that's basically comparing to two pretty broken tanks.