I always found them interesting myself. I think in the the day they had safety issues but you'd assume they are good now. I got a 45/410 circuit judge in the same vein. What I found the biggest problem is the noise, that cyclinder gap which when using a revolver is at least held at arms lengh, is now just under your ears with a revolver carbine. Dont fire these without hearing protection, even as a one off, is my advice.
I don't know what quality these are but uberti is generally considered pretty good. A lot of the cowboy action crew favour uberti and winchester in the 1873 lever actions, two of the most popular in the sport if that says anything.I dont think as much could go wrong with a revolver as with lever actions which can be more dependant on loaded lengths/feeding. Id suggest posting on the USA CAS, SSAS forums( cowboy action), also
www.castboolits.com, there will be some US guys who have used them. Also call some aussie cowboy clubs and see if anyone usies them for fun. I found Cowboy Guns(store) in cowra gave good advice advice over the phone when I was looking into old levers, they might be able to help as well.
edited to say, just realised it was you dabi. How is the alfa 22 LR carbine going, did you recieve it yet?