Quoted from JStoltz:
Lot of folks suggest PinMonk's colored gels for the 2x/3x/4x/5x, BOOM lanes, and the mode ladders. Also see a lot of suggestions to replace the stock red GI bulbs with Comet 2SMD Frosted Sunlight bulbs, as well as get their additional spotlighting kit for brightening up the middle of the playfield. Check the last page or two of the thread on that last one though, there's a good amount of discussion on alternatives.
EDIT: Shaker motor!
Just to add to this, 100% on the LED swap. The red washes out so much of the detail on the plastics, such as Deadpool's to do list on the left side.
For the colour gels, if you want more control to customize and/or if you want to save some money you can get gel filters that you can cut and combine on your own. Google or Amazon "gel filters for lights" and you can get a pack of coloured sheets for cheap.
petrieslastword do some research within this thread re the Katana entrance and other ball guides you might want to put washers under. They have somewhat "fixed" this in newer builds with a notch cut out of the bottom of the front of the guide as well as removing art underneath it so wear would likely not be as noticeable. I would suggest protection under the Katana guide, the left ramp (closest to your flipper) and the guide behind the Wolverine spinner. All of these places can potentially dig into the clearcoat.
And unless they have improved the Hellhouse scoop protector, it is flimsy and can start to sheer which can lead to rejects.
Enjoy your machine when you get it home! The callouts and music are so good on this.