I'd agree with that too - I've got two units installed in my VW - the empeg, going through my JVC MP3 CD player's internal amplifier. I purchased the JVC approximately 10 days before the firesale of empeg units, and had it professionally fitted, otherwise I probably would have sold it and bought an amp instead.
I can honestly say that, in the month I've had my empeg, I've used the JVC for RDS traffic reports (which you don't have in Canada/US I believe), and once when I left my empeg in the house and was in too much of a hurry to go back and get it.
I also must say that I'd heard everyone say 'once you have an empeg you'll never need a CD player in your car' and didn't believe a word of it. I do now
Cheers,
A.