Diane, the K-R's have a high quality smooth finish on the stainless, so food tends not to stick. They also have a thick disc of aluminum encased in the base so they heat very evenly. I don't find that things burn in them easily, and if I get careless stuff comes right off with a normal scrub sponge.
That said, I don't fry much and rarely resort to my only non-stick pan, so it will depend on your cooking. I do saute onions until they start browning and then deglaze with water or wine, and that works great in my K-R's.
If you do think you're in the market for a K-R, don't just think about capacity when you choose it. Think about how you cook, do some measuring of your favorite pots, and then go to the K-R website (or Shar's Kitchen) and compare. I find that my 7L is uncomfortably tall and narrow for how I like to cook. I use my 3.5L almost every day, and I think I'd love the 2.5L braiser...not to mention that Cadillac of K-R's, the 5L hotel braiser shaped like a Dutch oven and priced way out of my range.
I intend to end up with an assortment of sizes if I do this crazy thing. DH won't have to think hard at all about Christmas and birthdays...