I've been messing with the stereo in the svx for about 2 years now. The sound quality has really improved but at the cost of time, money and frustration. I'm a pretty lazy son of a ***** myself but the satisfaction of creating something different for the car is overwhelming and makes me want to contiune to improve the car, stereo or otherwise.
I don't think anyone can answer the question, "Is it worth it?" because it's personal preference. I find it fun and rewarding.