This application deserves more than a 3.7. Its rightfully around 4.5. I use this 4 times everyday, to synchronize a computer at home, one at work, and my laptop which "carries" the sync between. I sync around 150,000 files/folders at each time, and it takes me about 2-3 minutes. I use many of the advanced features. It has NEVER let me down and any issues I have had have been promptly addressed by the developer after contacting him. I repeat this again - this is NOT primarily a backing up application (although it can be used as such), it is intended for synchronization. Use it in this mode, and there is currently nothing else out there that does as good a job.