Alright, I sent for a demo of one of these last week - got it on Friday. I've used it for three jobs for a total run time of five hours. Here are my very early thoughts on it:
I like the size and portability of the unit
I like the weight
The pump out actually works as advertised
Hooking up to the sink was not the giant nightmare I imagined it to be
It works well with my 360 - I would not recommend using this unit without a rotary jet extractor of some kind
It is a neat machine for what it is, at a reasonable if not inexpensive price point
It is easy to completely clean, inside and out
It is not a mini-TM
It is not an all purpose heavy duty portable like Greenie sells - if there's not a sink with a detachable aireator available you may be hosed (pun intended)
If there are people around and underfoot you have enough cord, hose, empty hose, cord from your rotary extractor, to assure that somebody trips on something
On balance, I like it. It's a small, lightweight, functional backup. It's handy for apartments, shut-ins and after hours gigs when running the TM is sure to piss someone off. It's a good unit for someone like me who has tons of toys and options. I'm not sure I would recommend this to a rank beginner - cleaning like this has some shortcomings and you need to be able to deal with those.
That's all I've got for now - I'll keep playing with it.