I'd consider yours, but there's a couple big problems right now:
1) Doesn't support IE.
2) Doesn't work on mobile
There's other issues, but those are the show-stoppers.FWIW, Chute (http://getchute.com) has a better implementation of this concept. That said, I still haven't seen enough of a value add here (with Filepicker or with Chute) to depend on yet another black box service that may shut down tomorrow.