You are worried about flare-ups: When grilling fatty types of meat on a propane grill, you run the risk of having flare-ups, where the flame gets too high and too hot, burning the meat. You have to keep a close eye on the propane grill to guard against them. But with the Traeger grilling system, the even distribution of the heat and the indirect heating system prevent this problem.
As far as size goes, bigger is usually better when it comes to pellet grills. A large hopper means a longer time you can cook without needing to refill your fuel source. A bigger grill size means more room for a variety of meats or side dishes. Look for at least 700 sq inches of cooking space (that can include the upper rack as well – remember, pellet grills work like convection ovens.)
The biggest cleanup issue is the buildup on the heat deflector under the cooking grates. You'll need good gloves and an apron. On most models, a thorough cleanup means a 30 minute process of taking out the greasy grates and the gooey deflector plate, scraping them and washing them. You should do this when the carbon and grease cover the deflector plate. Stainless parts can go in the diswasher, but I wouldn't do it. That grease is like tar and it could get all over the insides of the dishwasher and hang on for dear life. I use a handheld steamer like the Steamfast SF-320 Portable Steam Cleaner shown here.
***Update: 11/2014: It's been a year now and I still adore this little grill. I've got a kamado and 3 different kettles and this is by far the most convenient and easy to use. The smoke rings this guy puts on a brisket are amazing and the flavor is the perfect balance of wood flavor without overpowering the meat. I've researched about 15 different pellet grills and I still can't find a better value than what this grill offers
Bake, braise, grill, smoke, and sear – all of these cooking techniques can be fully experienced by just using one unit of backyard cooker! Yes, you can definitely do different kinds of cooking to your pork, beef, fish, pizza, or pie by just using the Camp Chef Smokepro STX Pellet Grill without burning charcoals and woods to start the cooking process.