You have to peen out a rivet for the fronts. Not a novice job. And getting the fluid right looks very not fun. It was worth the $150 paid, with parts already in hand.
I have an Ohlins TTX and the difference was much more dramatic than when I got the Andreani fronts installed. I wouldn't get one that doesn't have full adjustability or isn't tuned to your anthro's, like Mupo. My HM is a do-all work/ play bike so I wanted full adjustability.
Many performance riders will tell you doing just the fronts can be worse than the OEM setup, which at least is balanced to compliment each other. I think some extremist will say your better off doing the rear first. Of course, I ignored all this and ran front inserts for 2 years before pulling the trigger on a rear.
OEM was fine on my great FL slab. When I moved to Europe (Naples, IT), whoa. I think rural Anbar Province has nicer roads. And Death Race 2000 on the nicer sections. The stock pre-load adjuster just wasn't keeping up with what I needed. Granted, serious financial commitment, especially for a bike (mine, at least) that isn't worth the value of bolt-on's it wears. I paid about $900 for a new TTX. Justification is I will probably make this a track bike in the future.