Once you figure out how to use this application, no thanks to the lack of decent documentation, it can do some useful work. The Donkey/Mule network can be pokey if not glacial. FastTrack is dirt slow to connect, but once it does it works great (too bad people have been poisoning the files there, however). Trouble starts when you become ambitious and try to download big files or lots of little ones. Then the beast appears in the form of a G I G A N T I C memory leak. I have watched mlMac, all on its own, eat up all my free RAM space (512 MB in no time!) then proceed to eat up all my disk space as well for virtual memory, hundreds of MB at a time. If you let it get far enough this FAT HOG of a program will bring your Mac to a STANDSTILL. All you will hear is disk thrashing and you will have NO CONTROL. If you can, force quit the beast, then restart, or at least log out then in, to clean out the space it ate. If you have let the beast go too far, a forced reboot and fsck are in order. User Beware! Looks cute, does nice work, has a vicious nasty hunger for memory space. Pray that eMule for Mac proves to be better, whenever they get around to finishing it.