I would buy a Pinsound instead. A beautiful sound package is so much more enjoyable throughout a full game rather than a colour DMD that you barely look at when you play.
Great thing about Pinsound is the unlimited flexibility in customizing your own sound packages and loading multiple sound packages that you can flip through.
Of course I am biased.
So, on Monkeybug's recommendation, I installed a Pinsound recently on my IJ. Probably the only machine in my lineup that I would go to the trouble of adding this mod on due to the great available sound package.
A word of caution though for those that like plug and play mods. This is for people who like to tinker. Once I downloaded one of the IJ mixes that were out there and set it up, it was a bit of a shock to the system. Lots of new and more robust content, but also a lot of stuff that was way too loud or hard to make out. The problem is that you're at the mercy of hobbyists who have brewed their own audio mix. These are not professional sound engineers... and neither am I. If you're confident in this area and can make some of your own tweaks or even an entire new track for one of your games, this is an awesome mod. The quality of the product is also top notch.
I was able to play around with the various sound pots and get the settings to where I was happy with it, but it's not for the purist who is going to miss some of the original content or for someone who doesn't want to crack into audio files and adjust themselves. I particularly miss the "see you tomorrow Indiana Jones" at the end of each game. But now there are several more end game callouts that cycle randomly. The guy who did the mix I'm using just didn't seem to like the original, so it shows up very infrequently.
Otherwise, it's a great product and certainly can have a larger impact on a game than the colorDMD.
That's my two cents.