I'll preface this by saying I've never sat on any of the above mentioned aftermarket seats, so I have nothing to compare to except stock. My biggest problem with the seat is the feeling of pushing you forward into the tank. I had an Airhawk-R seat pad on my cruiser that I tried on the Strom. With a little trial and error of placement and volume of air, I was able to make a pretty big improvement. I put it fairly far forward on the seat with minimal air and am probably actually sitting off the edge of it on the back.
I may look at one of the nicer seats someday, but just can't spend those kind of bucks on a seat right now.
2014 V-Strom 1000 - Desert Khaki
2011 Burgman 400
2007 Honda Helix
2013 V-Strom 650 - sold