I've had a number of them over the years. The SxS 45/410, the O/U 45/410, the SxS .357mag, the .22rf over 45/410, the pepperbox 45/410 & pepperbox 22rf, the 18" 45/410 SxS, and the single shot 45/410. Not one failure - ever..
If you're a wuss, or unaccustomed to guns that roll up - the stiffer 2.5" and the 3" 410's might not be fun for you. You might want to take a file and de-burr the edges of the receiver sideplates if the factory didn't do a good job.
I usually shimmed mine at the pivot pin so they weren't so "floppy" when open. I use plastic from a pop bottle and make a washer for each side of the barrel lug.
Keep in mind that extraction is manual, so keep a pocket knife, small screwdriver, or something to pry out the empties. Do NOT shoot .45 Colt+P's, .454 Casulls, .460S&W, or .450 Mongo's in the FMJ/Cobray/Lienad derringers despite the fact that they will fit. Only use standard .45Colt loads and 2.5"-3" .410's.