I have been using Fox Farms in soil since April 07.

for the first year, I spent little and went with only Grow Big for Veg and Big Bloom for Flower. I would give nutes about once a week.
The thing i liked about Big Bloom is that it wont burn your plant.
Read the info on it, its got a nice variety of ingredients.
major nute%
0.01% N
0.3% P
0.7% K

I was using a soil mix of 2 parts MG soil, 1 part plain potting soil, and 1 part perlite. The MG soil is nutrient packed, but I flushed before use.
I also didnt add any nutes until at least a month in.

Altho the Fox Farms ppl may recommend not using Big Bloom as a stand-alone during flower, it did work for me, for a year. On 2 grows it worked remarkably well, given the conditions.

I have since started using the full line and have gotten the best results of my life on my current grow.
I'll Always use the full line from now on.

-edit- forgot to mention that I use the FF feed schedule for dosage amounts and i cut back to about 75% strength. but, i give nutes almost every watering (each watering is about 2-3 days), so they get nutes about twice or 3 x's a week.