No you can change back easy I just got one for my CFTBL and it is amazing. I am waiting anxiously for them do do Star Wars Data East now.

Adds $400 value to the machine. If you can't get your asking price, take out the colorDMD and sell it separately.

ColorDMDs on the whole are appreciated and add value to a machine.

Video sample half way down the page.
http://shop.colordmd.com/colordmd-replacement-display-for-star-trek-the-next-generation-pinball-machine/

Absolutely adds to the value. If you decide later that you want the game original, it only takes a few minutes to reverse the process. It's also one of the few mods where it's reasonable to expect your money back.

Personally, I can't imagine reversing the process for any game I have a ColorDMD in (unless I ever sell my MM and the buyer wants it as new)

ditto all of the above. wasn't sold on the concept of the display as it originally appears, only in color, but after seeing one in person (TSPP @ Expo, Thanks Chris Gray and the DSMpinball guys) I was more impressed with the increased resolution. Looks like it should always had been there. I'm saving my pennies now in hopes of picking one up next year in Chicago.

Adds about $300 value IMO.

Agreed, unless you're throwing in a good original display too, then you could maybe get closer to your $400 back. It's a killer upgrade, can't wait for Tron so I can get all of my DMD games in color!