I had the AK-20's put on the new SERGU a couple of months ago...I had them on two other bikes in the past and got spoiled. There is nothing else better, IMO. When I was there, Dan had just gotten a shipment of 10 pairs or so of shocks for HD bikes and was shipping all of them out that day, so people are still buying them. The activity here on this site has calmed somewhat from what it was a few years ago, but there is still some activity. In my opinion, there is no better regular type shock out there that's better than a properly set up Bitubo. They provide an excellent ride and are almost infinitely adjustable. Talk to Dan at Traxxion...he's the shock man. Be sure to tell him you're from the CVO site...it sometimes takes a little while for him to get the shocks in from Italy, so some patience is required, but you won't be disappointed with the end result.