Well at least the ESA is from WP suspensions which has made a good name for themselves in the off-road market. That is what I have on my KTM 950. Of course KTM owns the company. I think that it will at least lend itself to rebuilds well and maybe even a little more fine tuning at that point. Not sure that the KS would be a great deal different in the handling department on the street with the swap out from WP to Ohlins. I will concur that when I changed a rear Showa on a Ducati 996 I had with an Ohlins unit I was shocked at the difference. Total adjustability and smoothness I have never felt.
2004 KTM 950 Adventure S
2010 BMW R1200GS Adventure