Absolutely, I had a TX5 T5 fixture prior on my old 55g reef. The things I love about MH are the shimmer, the fact that I don't need supplemental lighting (personal preference). The power of a single bulb is really nice, less to replace, less color variations to weigh.
I have yet to go through a summer season running the MH so we'll see how hot things get. I have the pendant on an adjustable wiring system so I can raise it up if I find things are heating too much. I'm not that concerned as it's just a single 250w not enclosed either. I am also getting an ATO to handle the evap in my sump, it's comparable to my old tank though, which is cool.