There's a definite learning curve in getting the most from this grill (plus you'll need several accessories) and I suspect that's why lightly used ones are often found at a good price. Most of the complaints I've heard relate to the lack of heat produced and I'd agree with that. it's forte is not boiling water or putting sear marks on a steak but, with patience, its pretty good at most cooking tasks and. with the recently introduced larger charcoal basket and a set of Grill Grates, does an acceptable job on a piece of beef.
The Cobb isn't my 'go to' (still use white gas and/or a small hibachi for most meals) but its the only stove/grill I have that can barbecue, bake, boil, grill, saute, roast. fry or smoke. That it uses very little charcoal and, even with all accessories, packs so small are added benefits. If I had to pick only one between the Cobb, Coleman, hibachi, discada or dutch oven, it would be the Cobb. Fortunately, I have room for all five.