The best thing about this product is that it allows you to send files from one location or computer, without having them physically in another place at all times! It's free too -- which makes for an easy decision as well because there are so many other options out their with cost attached (even though they're good ones).
There aren't any cons I can think of right now since we've been using YAMI MFT X Servers over just sending via email/skype etc., but if those features were available then maybe some users would prefer such things? We use these servers mainly when our offices get really busy during rush hours / holidays where people need access immediately upon arrival; therefore allowing us time away while not letting others have priority ahead of ours who arrive later than expected due to traffic delays outside office buildings - especially important considering how often employees' cars break down before getting home.