I was having some problems in OS X 10.9 Mavericks with my Synology NAS recently, but it turns out there is an update for it. I updated to it yesterday and so far my file transfer issues are gone completely. I never had these problems in Mountain Lion 10.8. I also enabled SMB 2 on the NAS and I managed to hit 112.5 MB/s (900 Mbps) on the NAS with a 15 GB file transfer to my laptop (which has an SSD). I've been over 100 MB/s but I don't think I've hit that high before, although I haven't done formal testing. Have you guys noticed faster speeds with SMB 2 on Mavericks? What about reliability? I can't say much about the latter because it's only be active half a day now.