i think you should cut out the holes and fit 6.5's, and as for if the speakers are any good idk because ive never heard them but i know alot of people have and like the kappa's.
Some people like the Kappas, but components with an amp are really the way to go. It would be a waste to run speakers off the HU in the front. What we think of them shouldn't matter all too much, it's just if you like the sound or not.