Sootch00, Hickock45, MAC, MrGunsngear, GunGuyTV, and TFB TV are my favorites. Not all neccesarily for reviews all the time, but all are good channels IMO. If I had to pick one out of those as the one I go to the most for reviews, it would definitely be Sootch00, we seem to have similar tastes in guns and gear.
I also check IraqVeteran8888, NeverEnuffAmmo, NutNFancy, TheYankeeMarshal, and Hegshot87 pretty regularly as well. TYM and NutNFancy I don't watch as much as I used to, they can have some useful information but their styles have kind of worn on me.