Last week, I tried the Klondike brand Slim-a-Bear Ice Cream sandwiches in my early stages of a search for a "diet" ice cream that I could include with my Spring, ahem, lifestyle change. It wasn't horrible, but the Slim-a-Bear definitely tasted like it was intended to taste - "light."
A couple of commenters recommended the Skinny Cow low fat ice cream sandwiches, which I promptly snatched up at my local market, and they were right - much better than the Slim-a-Bear. The chocolate cake part tasted about the same, but I don't think it's the sandwich part that ever really packs on the fat and calories. The ice cream part was better. It certainly didn't taste like a smooth and creamy ice cream - it had the texture of a slightly icy frozen yogurt, which is much better than the melted-refrozen airy sponge texture of the Klondike bars. At 140 calories each, not a bad "diet" treat.