Just got an X1 Yoga 2nd Gen, and while the trackpad buttons (the mouse buttons, not the trackpad itself) seem more reliable than my X1 Carbon, they make a ton of noise. Unless you depress them directly in the center (which is difficult, given their width & the fact that I rest my thumb on the middle button for scrolling), you can hear a "pop" that sounds like one of those old-tymey Atari 400 membrane keyboards. It's loud enough that I imagine it would be irritating to anyone sitting next to me at work.
Also, the keyboard itself feels a lot "mushier" than the X1 Carbon. Are these symptoms normal, or do I need to RMA the thing?