Hello Reefstarter. I don't know of anyone who has the marineland reef capable unit on a 150. I have the 48-60 inch unit on my 60 gallon and have happy corals and good growth. I also don't have anything difficult, I have mushrooms, a duncan, various polyps/palys whatever you want to call them, and zoas. I've had it up since September.
There are others on here who also successfully use these lights as well. Again, I've yet to hear experience from anyone that has tried on a 150 so I'm not going to say one way or another but I DO know that my tank is deeper than 12 inches and I have corals on the bottom of the tank so people without experience with these should not just say they will not work beyond 12 inches. ;) I think that's the part that frustrates me.
Good luck with your light selection and let us know how it goes!