Was originally sent an open boxed unit with missing parts and sheetrock dust on install hardware.  I have installed many light fixtures and ceiling fans in my day and I have to say this one was a challenge.  The main power decorative cover is the same size as a back box so it does not cover the cutout in the sheetrock entirely and will require additional joint compound or caulking. Most covers are a half inch or more larger than a back box.  I choose the  s  curve shape for over my island.  It took a little to get it into shape, make sure you mark the middle of the track and all will go ok.  I pre-mounted the 2 anchors closes to the center, hung the track and then free hand hung the 2 end anchors to get the desired final bend in my s curve.  
It looks great and the heads adjust nicely for desired light focus.  But the cover design and installation would not allow me to recommend this unit.