I've had my WSCG for going on two months now. Since that time, I have fired her up about 20+ times. Mostly grilling, with a couple smokes thrown in. I have not done a butt or a brisket on it yet, but I have done ribs, chicken, burgers, sausages, steaks, apps, pretty much all your basic grill items. Most of the cooks were in the one hour range, a couple took two hours or so, and the rib cook took about 6 hours (other things were smoked too).
First thing I will say is that it is efficient. I filled the charcoal bin up when I first got it by dumping a new bag of KBB into it. I rake the old coals, stir in some new KBB, dump the ash pan, fire her up, cook, and then shut her down. The next cook I do "might" require me to open the second bag.
This WSCG replaced my Weber Genesis S-330. When it comes to start up time, the gasser would be ready to cook a little faster, but were not talking about enough time that I would want a gasser instead of the WSCG for after work grilling. I'd typically start the gasser on high, brush off the grates after it got over 700*, turn it down and let it settle, then start to grill. Twenty minutes? With the WSCG, it might take 30.
As far as temp ranges go, I am still working with consistency at the low (225*) end, can easily keep it stable anywhere from from 250* to 400* as needed, and like that I can open the turbo vents and go from 275* to over 500* in less than 10 minutes. I have not seen how high she will go yet.