I've got the Backup 45ACP and love the gun. I bought it new in '95 or '96, whenever they first came out (mine's the first edition, minus firing pin restyle and a couple of other changes). I never had a single problem out of the gun, and for a simple point-and-shoot with two hands, I can nail a life-size silouhette about 95% of the time at 15 yards. At 10-12 yards, if carefully aiming, I can put every round into some nice head-shots.
The gun sat for about 6 years without ever being fired (with a full mag), and when I finally got around to shooting it three months ago, I was having failures to fire and extraction problems. Turns out it needed a new hammer spring and a new extractor spring. It runs like a top, again. Spare parts can be had at Brownell's. I picked up a spare hammer spring and extractor spring, just in case I ever need them. I also have a spare firing pin, extractor pivot pin, firing pin stop pin, and a couple other parts - just in case. The original hammer spring "shrank" by about 1/4", and the extractor spring "shrank" by about 1/8". I guess all those years, being under compression, finally took their toll on them.
Oh yeah.....I even have the factory offered, leather, inside-the-pants holster that was offered through an order form supplied with all the original paperwork. It isn't an AMT-brand holster. It is made by someone else. I forget who, off the top of my head.
Edit - My Backup has had about 750-1000 rounds fired through it since new.
Edit #2 - Just checked that link, posted in the first post. They are no longer available at that price. Looks like those, and the 45ACP mags, are $25, now. Forgot where I saw them, but someone had the 45ACP mags for $16 each, a while back........I've been tempted on taking a standard 1911 mag and putting a little cut out where the mag catch is on the Backup 45ACP. If I do, I can use a standard 1911 mag, as long as the mag spring doesn't hang up on the catch (The Backup 45ACP will easily feed from the standard 1911 mag, but there is no way to actually hold it in the gun to prevent the slide from pushing it out of the mag well........Maybe an Officers ACP 6-rounder, with a custom pinky rest, will be a cool mod for the little gun.....Hmmmm)