Interesting.
I am on 10.10.4 myself, and that's the OS I tested it on.
tpwn has been tested from 10.9 to 10.10.5, but of course, your mileage may vary. the KASLR leak part is not 100% reliable, unlike the actual code execution which is. I'd be interested in panic logs to sort the issue out, if you could share.
Completely agree. Compare to BitTorrent Sync, which is proprietary but works perfectly out of the box. [1]
[1] Okay, this is true for BitTorrent Sync versions < 1.4 -- more recent versions have been less reliable, particularly with regards to cross-platform syncing.