Surefire's Nitrolon has really grown on me over the years, I have three nitrolon Surefire's, a 10X Dominator, 8NX commander, and G3, and the 8NX and G3 are two of the most comfortable lights to hold in existence, the 8NX being the most comfortable light I've ever held. However, I am not a big fan of nitrolon when it comes to LED's, particularly LED that generate any significant amount of heat. Because it seems that the tolerances in regards to size vary more with the nitrolon lights compared to their aluminum counterparts (threading and bezels fitting properly etc), and even with aluminum bezels, the nitrolon lights still do a poor job of dissipating heat. They are poor host's for most LED applications. However, they seem to be just fine for lower powered LED's.