I have been using a JEBO 4x55 PC
unit I got off ebay for about 6 months. Has worked great. I have the 48" light on my 75 gal
and we have even started adding some of the easier corals.
The unit has not had any problems. I will say that since it does not have any fans, it does generate a little heat. I could not use it with a glass top. I raised it up about 4" with a canopy and it does great. The other thing that I don't like is the unit has 2 switches but only one plug. You cannot set the actnic and the daylight bulbs on a separate timer.
I had actually considered getting another since my light is a bit weak for a lot of corals but 2 of those on my tank might be much.