Artnovion corner bass traps - anybody know if any good?

Wow, don't know how this stuff sounds, but it sure looks great!!

yeah it looks great.  Those appear to be tunable within a 20hz range.  They are only 2 feet by 2 feet squares.  Basically the same thing as a GIK Acoustics tuned membrane except the GIK is a fixed frequency (cannot be tuned).  The GIK are less than half as expensive ($400-500 for a pair).  They would both perform about the same.

Gik looks cheap to me.

well yes.  It is a very low cost option.  The fit/finish is not going to be furniture quality, but the performance is the same.  A tuned membrane bass trap is going to perform about the same regardless of manufacturer.  GIK acoustics is targeted at people who don't want to spend a lot and their materials and manufacturing is all based on that manufacturing budget.  I've worked with GIK traps and they work very well.  It all depends on what you want and how good you want it to look.  The Artnovion are built very nicely and you can tune the bass trap to a specific center frequency.  On the other hand, you can have GIK custom build their tuned membrane to a specific frequency as well (it's just not tunable).