I have the 6.5" SBH Bisley 454. It's a good gun, I had to clean it up a little. From the factory the trigger is a bit heavy so I put in some Wolff reduced weight springs. Overall for the features and size of the gun, it's about perfect from that perspective. I will say, I think it makes for a better 5 shot .45 colt than a 454 Casull, I bought mine with the full intention of it being 45 colt only, maybe a 454 from time to time but I don't need anything more than 45 colt anyways. The Bisley grip is great for big recoil, I'm very thankful for that.
That being said, I'm not real thrilled with the accuracy, not to say it's bad but mine doesn't seem to shoot that well (perhaps it's just picky). Maybe I need to break it in more, but the first strings I shot through it were more like patterns not groups. The cylinder throats are oversized, not exactly sure how much but .452" jacketed and lead bullets fall through them effortlessly. I'm not so sure that hurts accuracy, I've heard Ruger does it to relieve some pressure. Mine seems to like warmer loads a bit better, from an accuracy perspective, but I'm really hoping it starts grouping all 5 tight. I'll have two or three pretty tight but then the next two or three are off in la-la land for some reason.
I've had several BFR's too, the 6.5" Bisley grip 454 was the last one I had. The BFR is definitely a nicer gun, not that the Ruger isn't nice, but it's BIG and heavy. To me the BFR is better but it's a lot to carry around, the 6.5" SBH is lighter and cheaper while still being a good gun, and for me it's a better overall package. I thought about a 500 JRH but until brass becomes available, for a reasonable price, I don't think I'll ever have one, but it's a helluva cartridge.