I switched from 2x250w MH and 2x140w VHO to two AI Sol Blues and their controller for my 60" 100G reef and could not be happier.
I mounted the fixtures 12" above the waterline and running parallel with the tank rather than perpendicular and the coverage is great, no dark spots and plenty of overlap. Best of all with my lighting schedule my Kill A Watt EZ meter says the lights should now only cost me $40 a year to operate versus the $25 a month or more for the old setup!