Quoted from CoasterG:

I just purchased a Doctor Who yesterday and I'm waiting for it to arrive.
Any initial tips, must dos, etc?
It doesn't have a ColorDMD so that's already on the list.
Thanks!

Quoted from pinballinreno:

Mushroom targets are really tough.
I couldnt get the gulf stream boards to work well at all.
Read my posts on this, read Faz's guide on this.
The mushroom optos are sadly not plug and play, they need careful adjustment, in fact since you cant get the correct optos any more, its a real hassle. You can spend hours on this, get it perfect, and still it will change later in the game.
The flexible opto carrier is the culprit, buying a new one at marco wont help (i tried that).
The swinks opto carrier is a godsend! well worth the money. Totally rigid, no weirdness. It has to be black.
I had the best results with the pindorabox.com opto boards. They are way better due to the narrow beam and higher intensity. They still have to be gently bent into alignment when installed.
Make sure they are perfectly straight on assembly, then adjust the couple that need help.
Add a shim of fish paper or 3 layers of tape to the side that sticks in so far that it hits the interrupters.
You absolutely need the paper shroud (templates are available), It has to be black construction paper or black fish paper,
Read my posts on this.