That's not a combo but a switchable ballast. You either run MH or HPS, not both. I have one and it's great. Haven't heard much about the Sunleaves brand, but the price seems about right for a grow store. I don't like the built in ballasts as they add too much heat to the grow area. It's much better for keeping the grow room cool if you can have the ballast outside, but if you can manage an additional 3-10 degrees in your grow room it doesn't matter.