I write code on several computers and I use Dropbox to keep the files in sync so that I am able to quickly resume working when switching computers. I've never had any kind of sync problems with Dropbox.

I tried doing the same with BT Sync. The biggest problem I had was that sometimes it didn't sync all files. Say I had a directory with 10 files and 3 computers in the BT Sync "network". It was not unusual that 8 files got synced between all computers but 2 of the files would never get synced to one of the computers. Then at a later time, randomly, it would resume sync-ing. After having this problem 3 or 4 times I went back to using Dropbox and never looked back.