I applied the Nomex stuff this past weekend. So far so good, but be careful putting it on as the backing is very sticky and doesn't like to be pulled off. In fact, I was unable top adjust one area it went on, so the middle cylinder actually sits slightly cockeyed, but I can deal with that, less than 2 degrees off.
It went on the door area, ring around the top, and also on the bottom of the middle piece, which is where I screwed up.
Overall, it did a great job of sealing. Virtually no smoke coming out anywhere, except bottom of the door where I didn't apply any. I was able to, after figuring out the vents a bit, keep it between 220 and 230 for over 3 hours without checking it. My Maverick 703 told me where I was at for temp, so maybe one more burn to season with some fatty meats and I'll have total control.