I had some trouble keeping it lit. In fact after two hours only about an inch of pellets were used. In my research I discovered that they don't suggest using cherry wood in the tray. It's hard to keep lit. I forgot that I had a mix of 60/40 100% hickory/100% cherry that I used.
I am going to try again soon using the 100% hickory. If that doesn't work I will switch to the tube.