I personally do not own, but have played through one.. A friend of mine does, and loves it. Great for practice, rehearsals and small Restaurant/jazz type gigs. For his more rock/funk type gigs he puts the Contra on top of one his 1-12" or 2-10" cabs.
Pretty much what you put through it is what comes out of it. Some guys think they're too clean, sterile sounding. Others love 'em because all they hear is the sound of their instrument uncolored.
They also have a model (Ten 2)with a forward firing 10 that's a little more up front sounding. It's also twice the $$.
http://www.acousticimg.com/#/ten2/lp