Once again I say this to you, 18:

"Great review! You should write professionally!"

I picked up a new stainless CS40 with ambi safety and metal rear sight back in 2003 when J&G Sales was closing them out.
Like you, the pinky extension mags hit me in the middle of my finger and were uncomfortable.
The round mag bottoms cured that problem.
The Hogue rubber grips are fine but I had to try making a set of "Big Dog" style delrin grips.
They are slimmer and help with concealment.
The .40s&w cartridge allows a 7 shot mag over the 6 round mag of the .45 but the higher pressures of the .40 translates to harsher (but not unpleasant) recoil and more muzzle flip.
When I got the chance, I picked up a CS45 top end and mags and the conversion is a little more fun to shoot because of the lower pressure of the .45acp round.
My next project with the little pistol is to convert to DAO with second strike capability.
Just to slim it down.
Yes, the CS pistols are great and very adaptable.

John