ive used it. i got mine at stauffer's of kissel hill. i like the organic kind that comes in a smaller bag. the big bag has pieces that are overly large. i dont use it anymore, because i got my hands on some really nice stuff for cheap. but it tied me over for a while.
Your choice of potting medium should be determined by the plants to be potted, your specific growing conditions, and your watering tendencies. The use of "standard" commercial mixes can be problematic if it does not fit your specific situation.