so subjective it's not even worth asking or answering as in my experience?...at first I rushed to slap on a 1 1/4" genmar riser and loved it...1 year and 50lbs less body weight later?....my busa had been becoming more and more uncomfy...as due to my weight loss my lower stomach was no longer resting against the tank and in part supporting my upper body/lower back...and it was just a hunch at first...so just to check and see?...I took the genmar back off and went for a test ride and...viola!....lower stomach just touched the tank again...all the sam support returned to normal...and now my favorite position is down on the tank with my elbows just barely touching my knees at full tuck..sold the genmar...stuck with the diet.
L8R, Bill.