Unbelievably slow gameplay. I had to keep the mouse held over the tile for 5 or more seconds while waiting for the click to register.

Tiles were teeny-tiny on my screen, and I couldn't change the view angle. If the tiles will be small, at least present them from above, instead of from the side.

Tiles are nicely presented, so I give a 2 for that. It didn't crash for the brief time I played it, but I think responsiveness is part of stability, so it gets a 2. Features are otherwise what I expect from a mahjong game, so that gets a 3.

There are so many free and stable alternatives to this tool. Here are three, off the top of my head.

If you're serving files publically, it's easier on clients if you just set up a web site to serve files using HTTP over SSL/TLS. No need to ask clients to pay $30 for the privilege of doing what millions of others do for free every day.

If you insist on using FTP in this day and age, perhaps for authenticated downloads, the command line tool 'sftp' (which means 'secure ftp', by the way) is free, stable, widely used, and available from your Terminal. Just set up an anonymous ftp account on a server somewhere, and you can retrieve files that way.

If you insist on authenticated file transfers within the Finder, you can even go one better than either of the first two solutions, and install 'sshfs', which allows you to remotely view files in your Finder over an encrypted link. That's free as well, by the way.

This application requires your credit card before it will do anything. Funny how they didn't bother to mention how much money they'd be charging for this little service.