I had a Napoleon Apollo for a while. I bought it from some place back East, but got charged a transaction fee - somehow the money went to Canada. That was a po. It had some nice features. It had a rod in the lid & hooks so you could hang stuff. I liked the handles & latches. You could buy another section (or more) & expand it - I didn't. The powder-coat had runs in it. That kinda bugged me, but figured customer support was in Canada & I was screwed. The grommets for inserting probes were too small. They are made of stainless steel, so you couldn't drill them out - they just spin. It was real leaky. That kinda bugged me. It was huge - not as big as a 22.5 WSM. That was OK by me. I could not get it to heat over 228*, but that was using the water pan. It was a fuel hog. I sold it.... almost had to give it away.
In retrospect & given what I know now, it was probably just fine. I never use water and rarely a diffuser these days, so I think I could have got it to work well.