I've been using this for a couple weeks. Along with Zcash, it is the most amazing crypto-engineering project I've seen in years. Imagine being able to share files on an ad hoc basis with anyone -- on any network. Share with someone based on Twitter, on Facebook, or email address. Even better, all with cryptographic proofs of identity, strong crypto at every level, and open source.
Came here to say pretty much the same thing. It's slick and easy to use. It's actually the 'dropbox' I've always wanted and if they introduce a storage limit I'd pay. https://keybase.io/jgrahamc
Or are you saying you prefer the command line interface?