I have the 24" with a MH + 4 T5 bulbs + moon. This was my first fixture and pretty happy with it. Great value. No problems.
Bulbs: 10K MH + actinic T5s look really good color-wise though I've never owned anything else. In the past few months my nice green algae has been replaced with cyano. Some have guessed that it might be the 1 year old MH bulb. I am dubious but it is a possibility.
Heat: puts out a ton of heat. As Northernseacorals suggested I have a small fan hooked to a controller. During the summer the fan is running at least 50% while the MH light is on which means a lot of evaporation (around 1g on a 45g system). Now that it is colder outside the fan rarely runs.
Quality: construction is a bit cheap feeling. No problems with it though. In the past there have been problems with the ballast causing fires. Apparently they moved to a new design a few years back that solved the (serious) problem.
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