I have generally enjoyed using BT Sync since about June and haven't run into some of the CPU problems other are mentioning. I use BTSync primarily for files that I was never really comfortable leaving my machine-- paper I scan, my work files, etc-- but would like to work on from multiple machines and have multiple copies of.

However, I have had at least two cases where a file somehow didn't completely sync and it was corrupted, totally unrecoverable. I am left feeling that versioning is the killer Dropbox feature that BT will never replace. I'm not sure what I'm going to do... I'm still using BTSync for a lot of stuff, but it has lost its trust.