A quick review:

I bought two pinsound cards from their website:
http://www.pinsound.org/

One for my DESW:

And one for my T2:

You receive the board, some adapters, an installation guide and a USB stick.

Installation is pretty straightforward.
Just make sure that you place the connectors and the flat cables right.
Here are some pictures of my DESW installation.
Old card
New card
New card

The audio remixes are downloaded here:
http://pinsound-community.org/

Place the zip file in an folder named "audio" on the USB stick and the card will unpack and convert the files if needed. This takes a bit of time but only happens once.

On the pinsound website there's also a nice tool to modify the audio packs.

So what is the difference?
Full stereo audio
Built in amplifier
Adjustment of bass/treble/balance for cab and backbox audio
Headphone/Line out
Possibility for multiple audio tracks

The multiple track feature is nice. You just add more packs to the audio folder and turn the volume to zero to swap between them. This means you can swap the original sound and the remixes on the fly.

You can change everything. Music tracks, call outs, whatever. Compared to pinballbrowser there's no limit regarding track length and sound quality.

And the support is great. If I have had any questions or suggestions for improvement I have had an answer back in a few days.

So I highly recommend the upgrade. As more people buys the card and more talented audio people starts working on new tracks it will only get better.

Regards
Finn