The older Dell Quietkeys are great (they also came in black, too, sweet). The
new ones, the cheesy black
curved ones, aren't the same. Sometimes when typing, I've found if you strike a key at just a slight angle on the new ones, it sticks & won't go down. It happens so frequently I've stopped using them (we have a ton at work and so it wasn't isolated). The new quietkeys just suck, they're cheap little crappy buggers). And they flex way too much.
Damn you Michael Dell, why couldn't you leave well enough alone?