For not being able to use my stock amp anymore, and for the stock rears to have absolutely no range without said amp, I'm pretty cool with this replacement. Not the best I've had, but it's a definite improvement. My exhaust (sadly) drowns out a lot of music, especially with the lack of sound deadening, so I wasn't out for audiophile gear to begin with. These little guys do what I wanted - provide bass where I had none, and allow the staging to still be balanced. If I keep the car long enough, I'll invest in something more, but I'm pretty happy with what I've got.
Pros: Stock had no low end at all after the head unit swap. It's nice to have some bass back.
Cons: I replaced 6x9's with these. I could probably say that stock performance was better, but stock didn't give me USB and bluetooth. My exhaust came from some uncharted level of hell (thanks, GReddy), so I'm not too anal about audio, but a bit fuller range would be nice. Still too good to not use.