its sounds decent, but you'll have a cleaner quality bass sound if you went with an aftermarket deck as you'll be able to control the actual subwoofer rather than piggy backing off of a stock head unit.
reason being is most places will use a device called a "hi-pass low-pass filter" which converts the audio signals low frequency into a rca output, with left and right aka white and red. which than goes to the amp.
by going this route, you have no control what-so-ever with the bass control why?
because, if you put too much bass on the stock head unit, than you'll have to turn down the gains on the amp, so it won't give it so much power.
but turn it around vise versa, you put the bass on the head unit all the way off, and up the gains on the amp and it'll sound pretty decent, but you'll lose the low-mid frequency on your stock speakers.
you can definitely achieve decent music, but if you want quality, go with an aftermarket head unit a sub pre-out