I've had this gun for about 10 years not. It's accurate and reliable. I've had very few malfunctions at the range. It is a little heavy for every day carry, but it is concealable, and I do carry it sometimes. My only complaint is the take down lever is starting to stick a bit, and more than once I've had to use a flat head screw driver to get some leverage on it to take the gun apart. Tool less take down should be tool less. I've read this is common, I've lubricated the take down lever and so far that's helped. This may problem may have been poor maintenance on my part, but if I was looking to buy this gun it's something I'd want to know. Switching calibers and size isn't something I've used. Every time I've thought about buying a different caliber, I've ended up just buying a gun in that caliber. It's a cool feature, but I just haven't found it practical. I think if you were limited to how many guns you could own for some reason, it might come in handy. But I haven't seen a reason to get it. Still a solid pistol, one of my favorites, and I don't regret buying it.