I bought the Airhawk R Seat Pad AHR for my SV650. I transferred it to my strom and it fits the seat pretty well. I have got the russel day long seat and have found that I no longer need the airhawk to be comfortable. It is now for passenger duty. With it properly inflated, it was about ¼” raise. Very small, you are not supposed to fill them with much air. Looks can be deceiving as when you sit down, it squishes.
On the SV it was amazing. After trying 2 aftermarket seats and still not getting where I needed to be (I used the sv for touring as well), the airhawk on top of a specer seat worked pretty well. It did prevent easily sliding around on the seat, and thus not ideal for aggressive riding.
Also have an Alaskan sheepskin that I put over the airhawk for the long trips. Now that is a combination.