I just finished my soil grow with a 250w HPS. Got over an oz/plant with no veg. Flower straight from clones. Only 2 plants the first time, because I used large pots.
This time I tried vegging with a T-5 Floro fixture and found it was causing one of my strains to stretch like crazy. Immediately switched to HPS and the stretch stopped. Started 12/12 and of course, the stretch is back, but that's to be expected.
I just don't like Floro's. If it's the cost of the light that turns people to CFL's then I guess I can kind of see that, but really if you look at total cost of ownership for CFL vs HPS (Small like a 250w or 400) the HPS is cheaper. It produces more product with less electricity. After the first grow the difference in production covers the cost of the light.