If you get a call from a company with an "iffy" name asking you to come in the next day, it's probably worth checking out first - actually for ANY company name you don't recognize... That said, it's sad to see people who were recently looking for work themselves now virtually exploiting other serious job seekers. It's the same kind of pseudo-honesty that brought down housing and banks. What they're doing is in no way "illegal" but if you were to really scrutinize the operation you would probably find some questionable practices.
What was your specific experience with them; how far along the hiring process did you go before bailing?
Good luck to you too,
M