I've about convinced myself to have a Progressive 465 shock installed, the 1" lower version, to lower the seat after installing the commander II 170/80 rear tire, and to get the better ride. A lot of bad roads where I live. Reading other posts on this I see a major issue with installation is getting the sag set correctly. A local dealer will install the shock for about $150 after tax. I asked about setting the sag and they said they would get it set OK for my weight but once set, it would cost more to reset it if necessary. So, my question is, if they get it set reasonably, 3/4 - 7/8 perhaps, am I going to be happy with that? I guess I'm also wondering, why is it difficult to get it set "correctly", that is, what am I looking for to know it is set correctly, or perhaps I should say, optimally? What's the effect if it is not set correctly?