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I do like the ISF suspension in most cases but there are those times when it just breaks my back and makes my passengers fly and this makes me sad. I too wish it had adjustable settings because then it would have the ability to deal with more situations.
In my 2011 the bouncy ride is nice when your passenger is wearing a low cut top.
I had Tein CST with EDFC on my dropped GS for almost 4 years and no issues and I loved the fact that I could adjust the setting on the fly and even had a few presets stored. As long as they are specifically made for the ISF Id say you will be happy