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I'm using the Arnott and like them very well, the ride is probably the best of any I have had. Had the stock shocks, changed to Progressive 412s and did not care for either one. The thing I like best about the air system is that it is adjustable on the go for what ever load or ride you have going on. This system has been on my bike for over a year and still has no leaks....the fear of most. The thing about this is doing a good installation.
Best shock for actually riding the bike is Penske. Nothing compares unless you wish to draw crows dropping your bike at the bar. Penske can not do that. If you wish to ride it, want the absolutely best ride than you need Penske.