If you really want something with an 8-inch barrel, maybe you should look into the LWRC PSD in 6.8. The only problem is, I don't think they're selling it just yet. :D
On the serious note, listen to the guys who really don't have a dog in this fight but is willing to provide you with quantitative proof that this is nothing more than hype. I have yet to understand just what the M16 Clinic is offering that is different other than a shorter barrel. It's not like they have a different gas piston system like LWRC, POF, or PWS. It's not like they have a special components (which is probably why sgtoinkz's bolt broke at 1K rounds).
Objectively compare what they are actually selling to what everyone else is, and then make your decision. FWIW, there are some pros in this forum who has had more experience behind an M16 either as an end user or a manufacturer than anywhere else, who are willing to provide their unbiased opinions. And chances are, if they say that a certain product is junk, it is from experience and not because they have an ax to grind. JM2CW.

