I did the BSW stage 1 upgrade with MB Quarts as well. I have to say the sound quality is better and more detailed. There still isn't the bass but I new going into this that I'd want to add a subwoofer at some point. I think I had found a link a while back about someone that made custom subwoofer boxes for like $290 or so...but I can't find it again (help anyone??). But that is what I was leaning towards and adding my own subwoofer to that box and installing it myself.

The BSW kit has good instructions, I also had to call Micah to verify some wiring and he was great to work with. I also bought the tools for door removal and they helped a lot.

If you don't feel too handy then have the kit installed. It is time consuming so make sure you have planned to have a good day of free time.