I am using 3 of the 250watt ones. So far not a single problem with them. I use them to run the Maristar light fixture. They are quiet (no fan). I suppose all electronic ballasts are like that though.
Previously I tried their combo ballast, the one ballast that runs two 250 watts in one package but never had success with it. Two of them failed on me within a few days of usage so I resorted back to using just the single 250 ballasts. Probably just bad luck on my part as I know a couple of people running (or ran) the duals just fine.
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