It's very nice. I'm pretty close to 3Gb I think... I haven't checked in a while. I use it to backup school files and other nonsense that I need.
And I've got a Dropbox story for you guys:
I needed a file for a school project, in class. I needed the source for a security program, which was blocked by my school's DNS (malicious files)... well, I hopped on my phone, downloaded it, and pushed it to my Dropbox account. Once the file was happily in the cloud, I was able to download it through that.