I had them, but just replaced them with XM 10K because I wanted a higher PAR. Also, I felt mine were a little too blue. I also had 2 96W Super Blue VHO - which were only being used for morning and evening lights. Without any other lights, going from the MH to nothing would be a drastic change that may not be appreciated by your fish or corals.
After switching, I like the 10K XM's, but any green algae on the back of the glass makes the area look a little yellow. If you have clean glass with a blue backdrop the 10k's look great.