I have been using leaf's in my cabinet for close to 2 years now. I have had no problems what-so-ever. My boys and their friends smash on them all day long. I can't see myself switching to microswitches. I have checked the underside of my control panel and everything is the same as when I built it. I wondered the same thing about the switches wearing out so I adjusted my player 1, #1 fire button switch a bit closer thinking it would even out over time. about 3 months ago i changed it back to the default because it never changed.
Use a scrap piece of wood attached to the underside of your cp to hold your switches.
All in all I like the way Leaf buttons feel and sound. I am no expert like some of these guys, however IMO the feel of my buttons easily beat the feel of microswitches in my local arcade. You may have to adjust them one day but I am still waiting for that.