I thought Id get someone riled up with that statement. I have heard all of those bands, and no, besides Pain of Salvation, and Symphony x, I really dont see any musical progression or value of any of these bands. They are far too technical, and lacking in any interesting musical ideas. Dream Theater does atttempt many new things, but they never seem to go anywhere, and they are always hampered by needless overly technical soloing.
But hey this is just my opinion, you dont have to agree with it, and I dont car if you listen to prog metal all day.
Porcupine tree is not a metal band.