I occasionally use a pair of replica (Uberti made) Remingtons in Cowboy Action Shooting matches, sometimes as cap-n-ball guns, sometimes with conversion cylinders. They work very well for me. As long as you start with decently made replicas, and the conversion cylinders fit properly, a Remington conversion should work quite well.
Uberti and Pietta make their Remingtons to slightly different dimensions. The conversion cylinder has to be made for the proper make of gun. They are not interchangeable between brands of replica.
If you get two conversion cylinders for one gun, you have a decently quick reload for your Remington. Several makers sell holsters and cylinder pouches for these. Just be careful during the swap. If you smack one of those firing pins hard enough, it will set off the cartridge underneath. This is generally a Bad Thing to Do.
As always, carry only five chambers loaded (cartridge or cap-n-ball). When the hammer is down, it rests on the firing pin, which rests against the primer of a chambered cartridge. (It rests on the percussion cap of a c-n-b cylinder) A modest blow on the hammer can cause a rather loud accident. This is another Bad Thing to Do.
Do not use full power or plus P ammunition in a conversion cylinder. The Remington frames are not designed for the increased pressures of modern ammunition, nor for the increased back-thrust of hot loads. The gun probably will not burst (at least at first), but it will quickly wear out. Those super-hot loads form Cor-Bon, Buffalo Bore, and others, are absolutely not for conversions. (Using such ammunition is a Very Bad thing to Do.)