I flew these a lot when I lived down there out of TCB.

They are ok, but only for an hour
There really isnt any adavantage to any of the seats, although in the front, sometimes the pilots dont close the "door" so you can lean and look out the front window. Dont get stuck in the back row tho, I think its cramped.

The luggage question I cant answer, but I never had a problem, I think it also depends whether you are connecting onto mainline CO or just using Gulfstream