I cant coment on the h&b , but I recently bought a lower set of sw's from a site member , to fit my 2010 1200gs , they look great. seem well made and after a quick trip to halfords for the sockets (the six pointed things ) I needed to fit them , they went on easily.
The H & B bars are made of 19 mm steel tubes, the SW-Motech's are 25 mm. If you look straight from the front the H & B bars do look lopsided, the SW-M are symmetrical. I do not like on the SW-M flat steel bar interconnection in front of the belt cover, I prefer tubing like the H & B.