I'm in the process of removing 2 Cliffys from my AFM (I bought the 4 piece set and installed a few weeks ago). The target protector in front of the force field causes the ball to jump just enough to clear the drop target in the back about 50% of the time. And balls too frequently get stuck on the lip of the rear SOL protector after making it past the pop bumpers. I'll probably keep the Cliffys around the drop target and the front SOL since they don't seem to interfere with gameplay.

I would like to note that this is on a relatively new (and un- re-shopped/re-cleared) Mirco playfield, which we know is not identical to OEM, so the Cliffy's don't fit perfectly, and that may well be why they seem to be interfering more with play than I expected. The Cliffys seem to be designed for a slightly thinner playfield than mine... They probably work a lot better on an OEM playfield.

If I had it to do over again, I'd wait until I saw some wear before I bought any Cliffys...the earlier plastic-covered couch is a pretty good analogy...

That's debatable - you don't "y"->"ie" proper nouns, and since Cliff is definitely a proper noun, arguably Cliffy is too. Hence my intentional "Cliffys" spelling...