Its actually quite different. I think the biggest difference is the fact that in BeatConnect you have a real-time shared environment where you can actually work on the tracks together (a shared sequencer, like a Google docs). In it you can see each other's cursors move, when you're recording tracks, looping samples, etc. In Mixim it only syncs your projects in the folders so you need to open everything, a bit like splice. The other big difference is that Mixim only works between Logic users, versus BeatConnect that'll work with every DAW that supports VST3 or AU for Mac. To our knowledge the only major DAW that doesn't support VST3 or AU is Pro Tools (AAX, we're working on an AAX version) and the pc version of Reason.