I've had the 100 (kinda small, but cooks well), the 200 with 2 folding shelves - very heavy and bulky, and the 300 on the permanent cart. On the 100 & 200, the older ones were built to be used with the skinny propane bottles only. You have to remove the skinny bottle support ring (not a big deal) to work with the more stubby bottles, which are more readily available. Personally, I never did care for the cast iron grates. I found them to alway be difficult to clean, but you have no choices of grates with these models. Additionally, I absolutely HATED the folding table/cart that the red unit pictured above is on. It folds up, but unless you tie it up with a bungee cord, it will flop open with the slightest touch. Just an absolutely TERRIBLE design on the table. All these grills cook fairly well. For me the 100 and 300 were better cookers than my 200. If you're considering getting a 200 for camping or portability, I think you're better off getting two of the 100's, which will take up about as much space, but be far less aggravating to move around. DO NOT WASTE MONEY ON THAT CRAPPY FOLDING CART. I pretty much hated my 200 because it was like moving a huge concrete block.