Just finished my first smoke on the YS640, ribs and chicken thighs. This machine is amazing. It couldn't be simpler to use. The chicken was the best I have ever tasted. The ATBBQ team was great, with fast shipping and they threw in some extras. I could not be happier and can't wait for years of great food off the YS640. Don't hesitate to buy this cooker or to order from ATBBQ.
****Update 12/2014: So I finally found something negative to report. Today I was cooking 2 pork butts and a brisket and discovered that this grill does not do well with wind on a brisk day (It was 45 degrees here today). When set at 250 degree, the smoker could barely make it up to 190 degrees. I was able to bypass the problem by throwing a cheap moving blanket over the grill (an $8 fix) but I think it's worth noting.
I've been using a pellet grill for a LONG time (Traeger for ~15 years?), so I know an upgrade when I see it. I just picked up a YS640, and it's amazing. I love removing the diffuser, adding the Grill Grates, and doing so nice searing! My first cook was a batch of rid eyes, and they were both beautiful as well as delicious. My "guest list" of people wbo want to come over for food keeps growing... Nice problem to have. Good friends, good food, good times.
I would make that decision based upon desired temperature. Very few of the smokers on your list can surpass the 485 to 500 degree mark. You’ll read a lot of discussion about grill grates helping you get into those higher temperatures and that product does work. I would simply pick a smoker that can get to the desired temperature you want like the Louisiana and the Memphis. Both can exceed 500 degrees and both can hit 600 degrees without problems.
After about 10-15 hours of cooking, you should remove the burn cup and dump the ash. If the ash builds up it can prevent ignition. Ash also accumulates in the bottom of the unit, but doesn't impact cooking. A vacuum cleaner with a hose makes short work of it. Only a few manufacturers, such as Blaz'n Grill Works and Camp Chef have a slide out combustion cup that makes cleanup much easier, but you still have to get underneath the deflector occasionally and suck out fly ash that has scattered around the lower part of the grill body.
Whenever you want to smoke with a pellet smoker, you will have to make a choice: What type of wood pellets should I use? Well, the answer may sound simple – whichever flavor you like the best – but might be pretty difficult if you’re smoking for the first time. Unfortunately, the only way to know which flavor you like most is to try them all at least once and then decide upon which one floats your boat.
With 440 square inches of cooking space, an auger-fed pellet delivery system, and a digital LED thermostat and controller, your cooking will be simple, whether it’s burgers, a whole turkey, or racks of ribs. The side shelf is a convenient place for cooking tools or plates while the bottom shelf can hold spare bags of pellets or jugs of sauces out of the way.