Just saw this on eBay, just the one of them. Some very mental sounds when the video gets beyond the 1min mark, somewhere between a poorly-bowed 'cello and a ZX Spectrum!
I like it a lot! It'd be cool if some of those controls had jacks for external footswitches and expression pedals. Also a clean blend for those of us who like to think we're still playing bass.
I imagine it's a tricky kind of box to sit down with and say "OK I'm going to make it do this..." but still, some really impressive noises for just one box to make.
