Just installed the 655 in my ride (warranty replace) it is the shit to my old 645.
I love the built in hard drive in the 7.
I got the 6 though.
I have had no issues other than the CD eject function no longer working after almost 2 years of service.
Clarion has a great warranty for the "pro audio series" 2 years.
Get the HU you wont be disappointed. the LCD display is waaaaaaay better then what I used to have.