I have been using my MES for over two years and had the AMNPS by the first week I bought my MES. I have taken out the chip tray and pull out the chip loader a bit when I am smoking to keep the air going. I am not one who can "never" keep the AMNPS tray burning and I am not one who "always" has a 12 hour burn without touching it. Sometimes it will work good and sometimes it goes out. But bottom line is I have used it almost since day one. Monday I was at the grocery store (that's HEB to you Texas folks) and I saw a bag of Alder chips on the BBQ aisle. I have never use Alder before and thought about trying the chips. St. Louis ribs in the basket with my wood chips and other goodies. Today I rolled out my MES and looked for the chip tray. Found it and set it in place. Put the ribs on after a good rub down and added a small bit of chips. Smoked for about twenty minuted so I added more, and more, and more, and more. About two times an hour. What a pain to keep adding chips. And sometimes I would have TBS, white smoke or dark smoke. It ended up about six and a half hours to really good ribs but I have taken out my chip tray and dropped it in the trash. OK, I got it back out and set it in the shed in case I get a newer smoker and give this one to my son-in-law. Thanks to Todd at A-Maz-N for making a great smoker. My MES is used a lot and I guess I just took my AMNPS for granted but nope, it HAS to stay with me.