Agreed, they look cool. However, the finish tends to flake off over time. Bright nickel is actually copper plating on the gun, plus nickel plating over the copper, so it adds a bit of thickness, doesn't work well in tight spaces. Solvents like Hoppes #9 are designed to remove "deposits" from metal, and nickel is a "deposit" on the metal. Use it, but wipe it off; don't let it soak.
I owned a nice nickel Model 19 once, but the finish started to come off at the leading edges of the cylinder, at the forcing cone, and at the muzzle.
Electroless nickel, on the other hand, is a different process. Doesn't flake (because there is no copper layer), but usually comes out matte. It is hard to make electroless nickel bright, because it is too thin. Polish it enough to make it shiny, and you remove the nickel down to the underlying metal.
Looks, yes. Durability, no.