Quoted from GoldenBear:

I just got finished modding my met pro wood back box version
LEDS look great
FF large subwoofer and speakers
Purple powder coated armor
Cemetery blades and speaker panel decal
Creeping death mod
The machine looks, plays, and feels awesome. I have had a lot of pinballs and have a collection of 10 machines currently, and I play this machine by far more than anything now...it is a blast. Best Stern I have ever played
I really believe the speaker upgrade is a must and it was so impressive I decided not to install a shaker motor I purchased because the sub is all you need
The blades with the creeping death mod (pinball refinery) adds an eerie glow which is impressive especially with fluorescent plastic protectors
The powder coated armor feels better so the machine doesn't have that flimsy Stern feel
With the above mods, the machine does not feel like a stripped down machine like many pros..it is impressive and I would highly recommend purchasing. I did not even like Metallica music and was thinking about trading for an AC/DC before I did the upgrades. Now I love the music!!! Gameplay is different from other Stern classics as it is a fast playing machine not a long adventure like LOTR or Simpsons, somewhat like IM.
Btw one can purchase the rising cross but it is expensive now (only vendor is Marco I believe) Redshift LED, the maker of the total light show mod, promises a cheaper version in the future. The total light show mod also has programming for the cross mod, I believe. I will know in a few weeks as I have one in box but need time to install.
Nonetheless, if you are considering purchasing any Stern Pro machine...this is the Pro to get! Unless of course you like stop and go pinball...for without all of the premium add ons this machine moves fast.