My wife used an Air Hawk when we used to long-distance tour on a BMW R1150RT. For the past 3 years we have had a 2011 Spyder RT and she "couldn't be more comfortable" - (her words, not mine). So the Air Hawk is redundant now but we'll keep it just in case the RT's very comfortable seat grows tired with age...
When we first started using the Air Hawk we figured that it would work best with a lot of air in its cells but we found by trial and error that this wasn't the case; the Hawk is at its most comfortable with much less air in it than either of us expected. :shocked: