Definitely improved my MET pro. Not so much loud but more balanced. The sub comes with one extra lead. One with more bass and one with less bass. Everything's wired and ready to go. takes 15 minutes. If you could build the wiring yourself I bet you can source everything for 1/3-1/2 of the money. But that's if you have the tools and skill.

Basically while it's nothing like an "OMG Home theatre type of awe" it's definitely a great although somewhat subtle improvement.

Edit: I got the basic 2 woofers and sub setup. not the Whole shebang! that's why it's subtle but you hear all of the game much better. sub isn't too overwhelming going this way.

^ yeah I paid for the wiring harness. If I was still educated like I was as a teenager on car sound (18 years ago) I would have never done this. It's just tidy and takes the nerves away if you're not familiar with that stuff. I don't mind paying for stress free convenience. Just wondering what you used and was it hard to work a crossover into it? Without worrying about stressing the machine?

it is subtle to an untrained ear. also depends on the room and if it's damp (sound wise)

It's like a sound bar. It feels the same if not just slightly better. But if you walk around the house you can really hear the audio more balanced. Yet is seems like it's a lower volume. People are used to the Dynamic home theatre difference. This will not do that, but you will hear call outs more clear. You can dial in the sound ever so slightly better and as Vtech said you hears the highs, the woofer gets the lows, but the midrange is WAY BETTER. Again, If you know your sounds and how to wire it. I'm sure some craisglist tweeters could do 100% better. But unless you understand all that and how to integrate it with pinball, I recommend at least getting their basic kit. Then after a while you just have to upgrade the tweets in the back box. CHEAP! amazon or w/e Not worth newbies or even those with a general idea of wiring and stuff (which I don't think I even have) but I'm trying to learn. to try to get better sound for the same $ or the same sound for 1/2 the price. Like I said, stress free and I did change the volume (met pro) on speech, gameplay and w/e they call the settings. tinker! you might be surprised!

This is a great Layman's way of saying Don't mess with this unless you understand the basics. That's why I bought the kit.