I've heard both good and bad. Personally, I don't think you can make a decent living with it unless you put in a 40 hr work week.

If you want to find the nitty-gritty of a company, try googling the name of the company with the word scam. If you get lots of results on lots of websites, it's a pretty good bet that only a certain type of person can really succeed. If you only get a few results, or if you see one disgruntaled guy posting on lots of forums all over the web, you know it's probably a good deal and only a few people got burned.