Installation isn't too bad. You have to take the ball guide off to get to a couple screws and take off the VUK under the playfield, if I remember correctly. You don't have to put any holes in the playfield, the screw holes line up with the existing screws. There are instructions on Cliffy's website for installation, I think. Took about 15 minutes.
As for the price, that's just how much they cost.