Mike Cumpston and Johnny Bates reviewed the Pietta Starr SA in their second book, Percussion Revolvers, A Guide to Their History, Performance and Use, which may still be available on amazon.com. Don't confuse this with their first book, Percussion Pistols and Revolvers, History, Performance and Practical Use, which does not cover the Starr.
The title of the chapter gives a clue as to their opinion of the gun: "Treason With a Hair Trigger: The Starr Revolver". I own one, and it's my least favorite percussion revolver; in fact, it's probably my least favorite gun overall. It's poorly balanced, does not point well and the grips are probably the most awkward of any gun I own; obviously I strongly disagree with Mr. B on that, but those are personal likes and dislikes. In addition, it's difficult to disassemble and clean in my opinion, so there's little about this gun we can agree on. How much of this is due to Pietta's execution of the design, as opposed to the design itself, I can't say. My main problem is removal of the pin to open the frame. On my gun, and on Cumpton's also, this pin is a very poor fit and almost requires a wrench to loosen and tighten. In addition, once the pin is finally out it takes a good deal of effort to open the frame as it does not fit well. I have similar issues with removing the screws and disassembling the interior (yes, I have gunsmith's screwdrivers). On the good side, it's reasonably accurate to point of aim and handles heavy loads well, with little felt recoil.