Aaron Farmerwrote a review of Black Diamond Camalot X4 on September 25, 2015
Familiarity: I've used it several times
Great little cam, always looking for ways to use my X4s. They feel super sturdy, especially with the aluminum triggers. Aside from price, I'm not sure why you'd get a C4 in the same size, since these are narrower, and will fit more placements, and just seem super robust. I've got 0.2 -> 0.5, and love them all. I am glad that the size ranges correspond to the same ranges for C4, since it makes it easier to grab the right cam (unlike the C3s, which have a totally different numbering scheme). Only X4 I'm not sure I'll pick up is the 0.75 (green), as it seems a little floppy compared to the C4 version.