I've ordered from Keling a couple times, no issues. In fact all the vendors I've used were really good for my machine, except HSD.
The good are, Home Shop CNC, Keling, 80/20, Gopher Electronics, McMaster Carr, CNC4PC, Doughty Drive, Gecko Drive, Automation 4 Less, all good. I've gone back to them time and time again and recommend them highly.
Bad is HSD. In fact, I hope nobody orders from them again;)