I have some of the microleafs and I like them.
They feel a little flimsy and they do make a very quiet click, but I can't hear them when they're installed in my CP. The buttons don't even feel like there's a switch connected to them. Right now I only have them installed on my primary fire buttons.
Out of the six I got, one or two were a little "off". It just wasn't consistent and would sometimes not fire. I swapped with another micro-leaf and it worked fine. I haven't fully diagnosed / tested the ones that gave me problems so I'm not positive they are defective, could be user error. As I noted, they feel a little flimsy and if you don't install them correctly, the metal arm can get caught on the side of the pushbutton actuator (I have HAPP buttons).
My only other issue is that the connectors are very thin, about half the width of a .187" connector. My .187" female disconnects don't feel tight on them, but they haven't ever fallen off by themselves.
I will probably end up ordering more for the rest of my CP when I get aound to it. They're worth buying a few just to try them out.
EDIT: I also wanted to add that I tried out some of these leaf switches even though they're expensive as hell:
http://www.arcadeshop.de/Button-Parts-Leaf--vs-Microswitch_566.htmlBut they felt really tight in a HAPP button and I actually preferred a regular microswitch to it.