They require a lot more cleaning, tinkering, and messing around with them to make them reliable. They are dirty and slow to load. Usually they aren’t very reliable right out of the box, and you have to be handy to address problems with them and you have to have patience.
Frankly they are about as far away from a convenient or user friendly gun as I can think of.
Tons of people buy them and don’t enjoy the experience and it’s associated baggage and the gun ends up a wall hanger or sold.
But there are some who learn their quirks and with some perseverance and technique you can make them reliable shooters and if you know the tricks they aren’t all that hard to clean at all.
Just think all this over before you buy one. They can be a LOT of fun and can be used in practical applications buy they simply are NOT for everyone. And that’s perfectly okay. I recommend you find someone with one and test it out before committing.
This is one I just recently bought. I did an action job and other modifications on it. Keep in mind most replicas are made in Italy and to a price point. Think of them as pre-assembled kits. They almost all will need or at least heavily benefit from some action work. Of 160 rounds I’ve fired so far, I’ve had ZERO issues. It’s a Pietta made 1851 Navy:
The actual experience of shooting these guns is a blast. The smell of the smoke, the huge cloud of sparks they throw off at night, the low BOOM report, SUPER near. I personally love it. Also the pace of loading and shooting is relaxing and almost therapeutic for me and I can just hang out in the desert for hours and not spend a ton of money on ammo. These are economical guns to shoot, especially now more than ever.
Hope this helps!