I got the shaker motor and underside pf service rails into the Ironman the other day with some help from beaky(  I prob could have done it myslef...yep thats how easy it is..... but then I wouldn't have got to catch up with the best tech in the biz!...thanks again mate! )
It sure rocks the house at max thats for sure...litterally quakes our little place, an excellent addition to the game! I can't imagine playing it without one now.
This one thumbs up for stern..all pro models from sm on are shaker ready...sweeet!
Thumbs down is no underside service rails on new sterns.....boooooooo!

No Probs mate.
It definitely makes a difference with service rails installed, It is just ridiculous that these are an optional extra.

I found the wiring for the flasher a little silly though, the instructions tell you to put the blue connector on the orange wire (which is the + wire) and the red connector on the switched - wire But then it tells you to connect the red wire on the flasher to the blue connector and the black wire to the red connector  .

The instructions for the rails tell you to drill some holes in the bottom of the playfield for the screws, yeah  right, the screws are self tappers anyway so there is no need for a drill.