I also signed up, but had a very different feeling. Sync is hard to get right, and so far (other than a brief but inexcusable security sanfu) Dropbox has been rock solid. Just absolutely rock solid, which is something I can't say about many services. There are many ways to screw this up; just look at Apple.
Dropbox is also the most transformative pieces of software I've ever used. It's not an exaggeration to say that it changed the part of my life that involves a computer. Finally I can keep multiple computers in sync easily, and if a system ever goes down or I get a new one I can have all the data/documents I need on it in one step. This is ONLY possible if I trust that system completely. I'm not sure anyone will ever unseat Dropbox for me. I pay them with a smile.
Dropbox is also the most transformative pieces of software I've ever used. It's not an exaggeration to say that it changed the part of my life that involves a computer. Finally I can keep multiple computers in sync easily, and if a system ever goes down or I get a new one I can have all the data/documents I need on it in one step. This is ONLY possible if I trust that system completely. I'm not sure anyone will ever unseat Dropbox for me. I pay them with a smile.