Do a search, there used to be quite the commotion about them, though that may have ben corrected...ballasts catching fire and stuff...though they are and have always been cheap, though that doesn't quite mean they are all crap.
After dealing with hundreds of CF/MH fixtures:
Coralife = Best, we sell these, we get these in used, sell them, get them back in used, sell them, replace ballasts rarely, sell them, pop in a ne LED, sell them
Current = Waste of money, WHEN it breaks it is done, though I'm sure there are many out there that will work great forever. We don't sell or recommend these, and places that do just enjoy the profit margins and telling customers "too bad" when they break, but when you stand behind what you sell then they suck.
Jebo = Never seen one in person, but after lurking here for a few years I am very weary of them. At one point they sold a 175W Doubled Ended Metal Halide...I'mma let that sink in for a second.