Okay, after reading your comments, I went and spent some time with the cameras I mentioned to make sure I'd remembered them accurately. I think I would have to stand by my original claims.
Flavio, I own a couple of FEs and an FE2 and my cameras are quite smooth in their operation. The film advance is very smooth on those cameras, and the shutter vibration is minimal. And it's my understanding -- I was told this by a camera tech years ago -- that a "feature" of the vertical Copal shutter is the raising of the mirror when the self-timer is employed. It isn't limited to the FE and I doubt very much it was a sales gimmick, since most amateurs who might respond to a gimmick have likely never even heard of mirror lock-up and why it should be used. I'm not saying it wasn't a feature that sales people used to sell the cameras, but I doubt it was a sales pointer provided by Nikon. I could be wrong, of course, but if I am, I'd want to see the Nikon literature pointing it out.
Cuthbert, perhaps the reason why my LX isn't smoother than it is is because of the sticky mirror issue. Hey, I wonder, does your tech in Italy take in work from other countries? I think the repair cost plus postage to Italy and back would be considerably cheaper than what Eric charges -- $200, which I think is rather steep to be honest.
With the mirror up I wouldn't regard mine as quiet. There's a noticeable metallic ring it makes when firing by itself. I compared it to my F3 with mirror up just now. The sounds are different, the LX's is more low-pitched for one thing. The F3 doesn't have the ring, either, but the volume is about the same. And, yes, I realize I'm comparing a vertical and a horizontal shutter, but so what? It's still comparing the noises made by two pro cameras that were contemporary with each other. And I really don't hear a volume difference between a vertical and horizontal shutter. At least, not with these two particular cameras.