Solar Generators - What Do You Know?

I have been looking at solar generators lately and I was thinking about getting one to power a portion of my house. I'd probably put it in my office and power all my computers and WakeWorld junk off of it. I thought it might be a good way to cut into my power bill and also have an emergency electrical supply on hand. I was looking at http://www.mysolarbackup.com/, but I'm sure there are other options out there. Has anybody done research on these?

I can't afford a whole house system and they don't work when the power is out (unless you pay even more for a battery bank), so that's not an option. Any feedback is appreciated.