I also got around to doing the Kicker woofer upgrade this weekend, and WOW....its definitely worth the upgrade. As others mentioned its not down the block, disturb your neighbors bass, but for passengers in the cab, its more than plentiful BOOM.
I want to say the hardest part was t tapping the factory subwoofer leads, was just a tight working space between the center console and the passenger seat.
I couldnt be more please with the bose system now with all new speakers (including dash 2.5") and the kicker upgrade. All in, I am probably $1000. I only wish the factory radio had a true equalizer vs the standard 3 option adjustment.