I have 3 Lowes Kobalt utility knives and I absolutely love them. I have 2 of the big ones, one is the regular blue handled one and the other is the stainless steel one with rubber inserts. I like the stainless one but it weighs a lot more than the blue one so I usually end up with the blue one in my pocket. Here's a pic of each.


I haven't had any problem with them dulling the blade, I very much prefer the blade holding system on these versus the Sheffield(I own one of these too).
My third one is a small keychain model. If I'm just hanging around the house I usually have this one on me. It's also good for carrying when I'm dressed nice. It carries 5 extra blades in the handle which come in handy with the little blades. But it does handle most jobs surprisingly well.