I've used this since release and I works quite well. The only problems I have are with the companion iStatServer application on my G4 running Tiger 10.4.11. The DiskTool portion of this crashes quite often and my connected eSata drive shows continuous activity a good portion of the time since installing. It works, in any event, as I can monitor my computer and connected drives from my iPod touch.
These issues may disappear when I replace my G4 in coming weeks.