That being said some of the older Compaq membranes are excellent. The SDM4540UL has a nice thockyness to it.
^this
My old 99 Compaq Membrane Keyboard is still alive and kicking ass of plenty crappy membrane keyboards such as my Logitech K800

Still, even the Tt Meka G-Unit, which I hate a lot (keycaps and internal built are crap) is better to type on than it