Yes, They are worth the approx. ~$100 I paid for them four months ago, but I would be willing to pay upwards of ~$300 to upgrade to a better set. I am picky about how stuff sounds.
IMO they lack in in your face aspect the OEM speakers had in the vocals, but it terms of clarity and loudness at the same time in the highs, mids, and mid bass they are good. They have good clarity and are very loud, loud enough to easily drown out all road noises and almost all of the engine noise even at full throttle, but not the in your face aspect most OEM systems have, and I feel if I really crank them the tweeters are too bright, but if you adjust the EQ and tone them down, they aren't detailed enough. I don't know how to describe it besides that they are good, but not highend for someone like me. I guess it just depends on how picky you are.
Mids are installed in a MDF Baffle in the door, and tweeters in the corners of the dash resting below the window next to the pillars. Mids being blocked by driver/passenger legs, and restriction of the opening could also be a factor in my car.
Pics of install *also there are other pics of the deadning, baffle, etc in the car audio installs/progress section of my picasaweb..