Just setup a hydra 26hd a few days ago. I've been out of town the last few days, so I have little feedback. Setup was easy and corals seemed to respond immediately by showing a slight change in color in corals that had none after just the first day.
I'll be home tomorrow night, so I'll have more to say after not seeing the tank for 4 days.
Btw-I'm running an sps dominated tank. 17g (24x12x14)
Matt