I just received and installed a full set of cliffys direct from http://www.passionforpinball.com/mm.htm I had to wait a few weeks for delivery as they are all custom made. Overall, I think it took about 2 hours to install the full set. The only part I had any difficulties with was the part behind the castle protecting the moat, but it wasn't that bad and I figured it out in about 45 minutes. The pieces themselves are very thing and I can see no difference in game play since installing them. The only thing I feel like is missing from this set is a small piece to protect the wood in front of the trap door. In addition to the cliffy set, I have a couple of small pieces of mylar under the drops, in the shooter lane, and protecting the wood in front of the trap door. I would highly recommend these and will be installing cliffys on any higher end machines that wind up in my basement. As I could find no installation videos for these, please accept my humble contribution to the hobby of me installing my cliffy set. Good luck and feel free to ask any questions!
Installation requires a 1/4 inch nut driver, 11/32 nut driver, and #2 Phillips screwdriver.
Top video shows where all the cliffys are, what needs to be removed to install, and how long each piece takes to drop in.
Drawbridge Edge Protector
Left Outlane Switch Protector
Right Outlane Switch Protector
Front Moat Edge Protector
Shooter Lane Eject Protector
Catapult Protector
Merlin Protector
Moat Jump Protector Part 1
Moat Jump Protector Part 2