Nope, that phone isn't going to work. It's running a Samsung-only OS with the TouchWiz UI and that's a dealbreaker. Here's a link to your phone's specs if you're interested:
While the phone model matters, it's the operating system that makes the big difference. SlingPlayer Mobile only runs on iPhone OS, Palm, Symbian, Blackberry and WinMo.
If you end up with a compatible phone later on, I think you get 30 days to try out the mobile players except for the iPhone version. That one you have to buy straight up.