What's the catch? -- Pricing, obviously

Hello.
Well, I've just registered and done my little thing here and there with the spreadsheet and word proc. application. Now, can anyone tell me what 'Try now' means? I was looking for a 'free online spreadsheet' solution just now and found this one which seems to fit my needs. Free? Hmm then what does 'Try now' mean and why it shows a beta version when in the application window?

Anyhow, the thing is, I don't see anywhere - Or I'm too lazy/busy to look any yonder, what the deal with this is. I need to start uploading some docs but I don't want to meet the 'whammy' while doing some important stuff and banned from using/accessing my own docs because I have to 'pay' in order to further utilize them.

Well, if anyone out there's so kind, patient and willing to explain this for me...I'd appreciate it! However, If it's actually free....I think I'd take a simple reply such as...It's just free you bummer !! Though that kind of reply may break my heart -- LOL, nah, just kiddin'!

Thanks!
Moris.