I've had my processor going on 6 years.  The plastic has not yellowed, scratched, cracked, or chipped.  The base has not had any problems with speed or slowing down.

I only have 2 problems with this processor.

1. There is no mixing/whipping blade you can buy for this.
2. The chopper blade base is plastic and gets cracks in it where the blade meets the plastic base.  And so far, I have yet to find a new replacement chopper blade I can afford.....as it seems it's cheaper to just buy another new processor, which is ignorant.

Although I love this processor, I wouldn't recommend it to anyone because of these two problems.