I have two and they both work pretty well, the ballast gets a little hot, but not bad at all. A little noisy, but again, not bad at all.
Have used it for two indoor grows now. Bulbs havent gone out, good bang for the buck.
For the price I would buy again, but, as I am getting a lot more experience and knowledge I now know paying out for the equiptment is going to be better in the end.. I would now opt for a XXXL magnum hood, and plenty other ballasts