I bought a variation of this thing from an auction a few months ago. Finally had some time to get it started and goof around with it a little. Amazing machine! With the adjustable deck height and track drive, it really works on some steep slopes (probably 70% or steeper, hard to walk on with a string trimmer).
Auctions out here they usually go for well under $1,000.
It would be nice if you could engage/disengage the blade, and perhaps kill the engine with the remote.