An adequate set of component speakers, infinity speakers are less used within the more "hardcore" modification scene mainly because the quality is not as top quality as people want, but for someone who wants that little bit more out of their in car entertainment system these speakers combined with a good head unit will easily create a good clean sound at relatively high volumes.
As for the tweeters, they do have a good frequency range and do provide a noticeable difference if mounted in the correct place. They are also quite attractive and would compliment the interior of most cars.
The crossovers im personally not too keen on, they aren't the best looking things, although usually crossovers are hidden some do look good when put on show, some of the vibe crossovers look quite good and mounting this way provides a nice twist.
All in all these speakers do provide a good sound, but in my opinion do not compare to other brands such as Vibe or Fusion, for a straight up upgrade however they are a nice set to have and will provide you with some good music; which if set-up correctly can give a good all round system for the front of the car.