I've had a German made PPK, and a US made one, and I've had three 84's and a BDA, and the 84 or BDA is much better, IMO. I think the 84/BDA is the best .380 out there, regardless of price. I would give a slight edge to the 84 because of the open slide, but I never had a single issue with my BDA that wasn't due to bad ammo..
I saw a guy shooting about a year ago at a local range, he had a blue 84, with a rail he made himself added to the front dust cover. It looked factory. He's one of those guys that makes all kinds of stuff himself when he can't buy it. I wish I had the ability to do something like that. I could make something that would work, but it wouldn't look perfect like that guy's stuff did. He had a small red laser on it and it looked like he had it sighted in just about perfectly. I wanted to ask him if he made more of them and to see how it was attached, but he got out the door and was gone before I realized it.