Smart Sync 4+

I have been using this software for over 2 years with no problems. and I very much like it. However after I upgraded to macos high sierra, problems started to show up. I have 2 main problems: 1- sometimes it finishes syncing without copying all the files. I realized there were some files left out with no reason. 2- In one sync job, it actually copied all the files to the destination folder (ı checked them manually one by one), but it still highlights some folders red (meaning they are not synchronized). Syncing multiple times does not change anything, still red highlight appears

Update: 2021 December
For some reason the syncing is not working properly in my Pro version. Files are not syncing according to custom settings:( I am afraid I am going to have to ditch this one. It was working great up to now,

Previous:
I downloaded this in 2021 on Big Sur OS and tried out the free version which worked like a charm. The upgrade is totally worthwhile as it lets you expand subfolders to see what files are unsynced. I transferred/synced 150GB of files without a hitch. Some of the reviews I read (dating 3-5 yrs) back were negative and almost made me not want to downloaad. But the free trial lived up to my expectations and the upgrade exceeded. It really does live up to the "Smart" sync name because it allows to easily set filters and setting on how you want data to be transferred back and forth and the ability to exclude certain folders, or if you just want to back up fron "left to right" (or reverse) etc. I hope the developer will continue keeping it up to date and no, it was not slow for me at all.

Real is virtually usless. No manual for how to use the application other than to send an email to the developer. Software has not been updated in years. No way to create a report or export a copy of what is being synced. Very limited functionality. Save your money look for an alternative.