I have been contacted by gsaapplications.com. Need suggestion.

I have been contacted by gsaapplications.com some time ago.They offered me help in getting GSA Schedule contract.
I have never thought about such way of expanding my business, but at the same time I got a bit interested.
Has anyone been called as well? Has anyone tried that before?

I get GSA emails all the time. However, I have never actually utilized it because of all the scams out there. These all cost money, and if I don't know the company and have not heard of them via friends, colleagues, etc, then I'm hard pressed to give them money.