Do not underestimate this sub due to its micro size. I had to make a hard decision between the 8" or 6.5" but in retrospect, I am glad I chose the 6.5"! If you're looking for tight, punchy, controlled bass, and you have limited space in your vehicle to work with - This is the one!! With adequate power, it will breathe new life into your current system! For the longest time I went without any subwoofer, and convinced myself my speakers sounded great - and they did, but I wasn't completing the full rich low frequency sound. Now, having upgraded my system with this carefully engineered enclosure and resilient 6.5 jl quality woofer, the double bass notes of dream theater now shake my bum. I will say, you will be surprised at how small this woofer appears in person, especially in comparison to the 8", but you'll be floored to hear the song it can sing!
Pros: Quality box, quality woofer, quality sound.
Cons: Limited power for those that like to turn the bass up. Although, this dependent upon the circumstances of your set up (power, amps, processors, LPF crossovers, etc.)