I have it on my DNX and can't really get how to use it right.
Google gives me a few reviews and some info on it but not much and none apply to car audio, only home audio and headphones.
Here's what I see/know about it based on me playing with it:
In my car it "raises" and "widens" the stage and does absolutely fantastic job there. It also somehow makes my highs clearer and very vivid in a good way but unfortunately it comes at sacrifice of low and lower mid frequencies. Low end looses it's "whooop" and isn't as bass-y as it usually is and lower mids loose it's punch. Kicks sounds kinda dull and thin.
If there's a way to keep my bass/mid-bass the way it is now WHILE raising and widening the stage I'd be the happiest camper but there just isn't enough info online about how to tune SRS WOW properly.
Some pics of my SRS WOW. Not sure if they' are needed but anyways: