Hazard, what type of fixtures do you have, haw long have you had them, and what do you think?
And I hope you didn't get one of the 24s they were talking about which used to come with no heat sinks!
I've had the d120 (value), Nova (older model, converted to a DIY Cree), 16" Photon, and 32" Photons. I've been using them since last May or so.
The value fixtures didn't have the heatsink originally, and to be honest, it didn't need one. The pcb board was thick, and kept it cool to the touch anyway.
The 16", 24", and 32" Photons are all cool to the touch at 100%. The Radion Pro got scalding hot at 100% after more than 5 minutes.
The beauty of these fixtures are the replaceable leds. I've modified my led layout for the better several times already, and so has Reefbreeders. It allows you to stay current with any new led advances and info.
No other fixture on the market has the power, replaceable leds, and control for the price. When there is one, I'll probably own that too.