I have used GoodSync both professionally and personally. At a former job we would sync development changes to a cluster of 50+ RDP servers. What used to take hours, we managed to get down to 35 seconds. At home I use it to sync between my two NAS's and I still help upkeep my ex-wife's NAS using GoodSync over an SSLVPN connection. It is a remarkable yet simple piece of software. I highly recommend this to IT departments that need to push/sync/backup very large numbers of small files. Just tell it how many threads to run at once, and BAM! done in seconds, instead of hours.