It's definitely legitimate. It's becoming more and more popular as a funding solution for small business. In fact, a contact of mine at Chase told me they're looking to offer the same kind of service in the near future.
The only "bad" part about getting a merchant account is, they require months worth of bank statements, previous invoices, ads, product descriptions, and other details about whatever it is you're claiming to sell. Lets not forget some providers are very picky about the type of products and services you offer.
Not that it can't be done, but it makes the approval process harder to get a merchant account when you're a start-up!
M.J. Glover, Chief Operating Officer & Investor
Blackstone Acquisitions and Management LLC
Website: www.blackstonecommercialcapital.com
LinkedIn Profile: http://www.linkedin.com/in/mjglover
Three words: Money. Power. Respect.