I know this thread is old...But I'll answer anyway.
I replaced my Shaker 1000 within 1 week. I knew I would, but thought I'd give it a fair shot.
Mine would almost like skip when playing an mp3 CD, not skip like you hear it, but there would be like a small fraction of the song missing. I like my music, and know most of my CDs and songs very very well, and can tell when a small piece is missing. Like I said, it didn't really "skip" as much as just left out like a 1/2 second of material here and there.
Plus I had a nice JVC stereo with my Sirius and all, plus it took SD memory cards as well as CDs. So I replaced it.
Also, took out the factory amps in the rear, and put in my old amp, left in the factory subs for now, and disconnected the door subs, it was too much, and the adapter I got for them, made them "pop" when you turned the car on and off, which I didn't like.
I'm looking at a DVD/Nav with a hard drive system next.
I hate carrying my CDs in the car, so I look for ways not to.
