All I can speak for is myself and my two piettas....
I did the R&D conversion myself and it wasn't that bad...his installation jig made it easy to line up. I did go through about three different hands (part name) getting the timing right but since then they have worked fine. I also installed the ejector myself which was much easier than the conversion.
I have also gone through about three different grips...I make a new set every year or so when I get the itch.
The major problem I had was with the firing pins...the original ones were too soft and peened over and started sticking so I got hardened ones which have worked fine.
I started out shoot hollow-base bullets which work great but are a pain to cast one at a time. I am now experimenting with heeled bullets, ordering some pre-made and a new crimping die before I get a 4 bullet mold.
I am also looking to get the pistols nickel plated as I understand that was often done when they were converted...that may be the first thing I don't do myself - although I did order the electroless plating brochure
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I enjoy getting into working on these pistols....It's not hard but it does take the desire to do it yourself. We used to have a saying, if it was easy, anyone could do it.
If you want to just buy a weapon, some ammo and go shoot - this probably isn't the route to go. If your looking for a challenge and a unique set of pistols - give it a try.
Feel free ask any specific questions you may have.
Good luck!