[masivemunkey]

They stopped being mechanical in the Early 2015 models, now they use force touch, which mimics a click using vibration.

It allows you to click anywhere on the touchpad with feedback (it feels like an actual click), which is pretty awesome, but you get used to it quick and it makes it hard to switch back and forth between a regular touchpad and a force touchpad.

You should go to an apple store and check it out.