Another downside is that we have reports of riders still sliding forward on the Kontour seat. Plus I don't know how well they can deal with shorter inseams.
If you want a bolt-on replacement for your stock seat, you're looking at Sargent or Corbin. If you want to have your existing seat reworked to your exact specifications, then go with one of the aftermarket seat builders. That means Bill Mayer, Rick Mayer, Russell, Rich's, Mr Ed's Moto, Kontour, and others. The aftermarket guys can reuse your existing heater element so you don't loose that function. Sargent and Corbin also offer heated options, but require you to cut off the factory plug and rewire the bike with their plug (no, thanks).
I went with Bill (Rocky) Mayer. I'd put 60K miles on the seat he made for my LT, including a 1,400 mile/21 hour B2B, a BB1500, and numerous 1k+ days without compliant. He did my GT seat the second day I had the bike, and I put 2K miles on it in the next 5 days and it just plain works for me. The biggest advantage to Rocky (besides that he was local so I could do a ride-in fitting) was that he doesn't put any seams on the top surface of the seat that might create ridges or pressure points over time. The biggest compliment I can say is that I just don't think about the seat at all when riding. And I don't slide forward at all.
When I was having my seat done, there were two other GTs there both looking for lowered seats. One guy had ridden down from Sacramento, and the other had trailered his bike down from Idaho (past a few other well-known seat makers). But the majority of their orders are mail-in, where you send in your seat with some pictures of you sitting on the bike, and describe what you want.
There is also some other seat discussion in this thread
that may be helpful.
'13 Dark Graphite Metallic K16GTLD, 24K miles and counting...
'09 Magnesium Beige Metallic K13GT, 60K miles miles and counting...
'02 Mauve Metallic K12LTC, 106K miles and sold
BMWLT#145, IBA# 366, MOA# 111996, SCMA# 24032
All lower 48 states plus Alaska on the K13GT in two weeks . . .
Some people see the gas tank as half empty. Some see it as half full. All I care is that I know where the next tankful is coming from...