Lovely concept and implementation. But...
It doesn't work for me on two Macs, both running Yosemite (OS X 10.10.3).
I run DropCopy on both Macs on the same network, but when I try to transfer a file (a large one: > 3 GB), only 154 KB gets copied to the target machine, and then DropCopy's "landing zone" just dies. The menu bar icon is still present, but there's no indication of activity, and when I quit the app, no warning or message is given about a tranfer in progress.
I've read the docs, gone through the support forum (which is read-only), tried a number of different configurations, but nothing works. Since the latest update was posted on June 10, 2015, one would think the developers would include Yosemite support.
I'll keep my eyes open for an update that works, but in the meantime, I'm just going to revert to the tried-and-true file sharing built-in that I've used for years.