Trust me. This thing - if you have a mac - will change your life.
Sure - it's not perfect - but it does provide a simple to use interface that works for under $200 bucks to watch, play, view - whatever iLife content and content your download on your TV.
I bought it because I wanted to watch DIVX and MP2 and MP4 files on the TV and use a remote to pause - play and fast forward. You can't do this (and don't bring up Remote Desktop or Remote Wonder) with any other product with any ease.
My old set up was using Remote Desktop (see I brought it up) and controlling a G4 Cube 450. There are tons of use issues here and you don't want to open the laptop - login into the cub - etc everytime.
In general though the interface is not great - it isn't bad either. Maya can use this but couldn't deal with the straight remote desktop solution which was much slower.
The 1.5.2 update also is a big move forward - and though it's not a mac interface - hey it's on my TV and it's easy to use. It plays my files - it references my iTunes and iPhoto - and until Apple makes something better (or ever does) - then it's the best solution for this content and control / aggregation issue.
Great job Elgato - keep updating it and making it better.