Never heard of them. There are A LOT of scammers out there so be careful. Two companies that I am familiar with and that are legit are: Kickstart locators and Midwest locators.
That depends. I pay for the machines only, no matter if they are on location or not. Who is to say you won't lose the location next week? Like I said, Venstars are cheaply made machines. Beware.
Go Along just to see how things are done. Vendstars are all plastic and very cheaply made. The chute doors always break off (look for this when he takes you). You will be paying about $105 per machine with location. I believe that is a little high. I would offer no more than $2,500 for everything if the machines are in good locations and good shape. Keep us informed.
I used kickstart and they were good. Midwest seems to get the best reviews. If you go back to the link I gave you, then there are other reviews on these companies in the "reviews" section. Good luck!