There's also the hassle factor. To have good light you need a lot of cfl's and, if you are using them properly, the lights constantly need moving because they are only a couple of inches from the plants and the plants are growing that much everyday.

I just moved from a box with cfl's to a cabinet with MH's and the cabinet is soooo much easier in terms of dealing with the lighting.

But.... I have the cfl box all set up with timer and fans and everyhing so I'm sure going to keep it and I can have an isolated growing environment anytime I want.