Well it would be nice of them to reward testers for installing and being monitored. They do that with other programs in the works. But it has been a while now since I've actually seen anything with direct rewards. Back when we beta tested Vista there was a reward program and I got a copy of Office 2007 Ultimate edition for free doing that testing.
I've been reading that MS is laying off more employees and cutting positions. So it is very unlikely to see much of the rewards programs as before.
If you are worried about installing ... then do not do so. But as I have here installed as a dual boot on my Vista machine. Seems this has a better install than the beta did. Having less problems with over run regs and files that write wrong.
But I'm very satisfied with having MS look at my systems here. They do it anyway... Plus this makes things work for some sort of progress at what I may want not just for this OS. But for the next one to come. Which I'm really waiting for Win 8 x64. Noticed one thing about the RC here. Seems to use a lot less memory and cpu than before. Plus it sure does not compare to what Vista use's. Big difference so far. Only thing is drivers for my mouse and keyboard are not supported. Sounds like Vista again almost. But the drivers they give you for those hardware items does work. Less all those fancy features you get from Logitech as such.
All in all I'll probably buy a copy of this when it is finally released. Seems a lot cleaner now than Vista was and I may need it for something. Like doing WB's for stuff and just overall testing of programs.
If you want to use a fair program for firewall and anti-virus ... Mcafee has a beta program - which is supported here on Win7. But you will have to signup for it if there is any openings. Not too sure about all that - but it works good for what I use here.
Anyway best of luck with the testing. Plus if you only have one computer and use it as your primary computer. Then I would be careful about testing and make sure you have a good backup image to fall back on.