I haven't used this for that long but I just love the concept and I am not longer ignoring friends telling me they have uploaded their next great idea to dropbox. I can just access it when i want in one place.
I've been using FYI for a few weeks now and it's just part of how I work. Using another computer that doesn't have FYI installed is weird and emphasizes how valuable it is to have instant access to every file across my most used apps. It's not just that you have access to your files, it's that you can get to them in so many intuitive ways. Just makes sense. Feels like something that should've been built into the operating system.