No first-hand experience, but some people REALLY like Cutco knives. I have bought and sold several on eBay. I know they do have a lifetime warranty.
Anyway, I checked their website about the dishwasher, and found this:
Keep Them Clean
Dishwater vs. dishwasher? While much high-quality cutlery (like CUTCO knives) are dishwasher-safe, it's recommend you hand-wash your knives and dry them right away to keep them looking great.
- Don't let your knives soak in the dishwater too long. The mineral content in some areas could stain the blades.
- If you use your dishwasher, we recommend you avoid using powdered detergent. Try liquid, gel or tablet detergent. Also make sure your detergent either contains a rinse agent or you add one to dispenser in your dishwasher.