Quoted from pinzrfun:

Did you end up getting the Monoprice one? I have 6 or 7 of the Polk Audio ones, you can usually get them with free shipping. I like that you can plug 2 games into one, and can disconnect/move them easily from one game to another, or if you sell the game. I also used one as a replacement for my home stereo when i blew up my other sub lol. Easy to sell by themselves if you want to do away with them altogether too. I've bought cables and accessories from Monoprice but nothing larger -

Quoted from PinWoofer:

Ours is an amplified replacement for the original cabinet speaker; dual voice coil speaker, mounting ring and amplifier. Fully integrates into the pin with no wires leaving the cabinet.
This differs from the solution you have mentioned (which is a terrific product, by the way).
There are many obvious advantages and disadvantages with internal versus external that will continue to get debated.
You can look through the announcement thread "New Amplified Subwoofer Kits by PinWoofer" as well.
We also offer an amplifier only option for those who have invested in aftermarket passive subwoofer upgrades. It is a way to get more out of plunge those guys have already taken.
Our kits are designed to be compatible with any amplifier configured to drive a 4 Ohm or greater load (impedance matched isolation transformers). I.e. a pinball sound board and other aftermarket boards.
So far we have been compatible with every pin install. Still, we're keeping track and will document on the web site after customer feedback.
Take a look at the website. https://pinwoofer.com/
Thanks for asking