In answer to the question about support. The company in question, orders the product from Apple and comes with the full Apple warranty and support just as if you bought it directly from Apple yourself.
Yes it works, yes there are lots of scams out there. And yes, nothing is every totally free. But you can still usually come out ahead if you do some research.
My referral link is in my sig, I'd love it if you helped me out. If you don't want to, then leave off everything after the .com portion.
And if you just want general info on these type of deals and sites, check out anything4free.com (it's not a deal, it's a forum based site like this one, but the topics are stuff you can get for free)