The taste really is quite similar to regular sour cream, though I find the texture to be slightly different. You can use Tofutti's Sour Supreme in any recipe calling for sour cream, or you can use it to top vegan burritos or tacos. Look for vegan sour cream in the refrigerated section of your local natural food store, health food store or co-op, or, you can also shop online at vegan specialty retailers. Some larger well-stocked grocers will also carry Tofutti Sour Supreme in their natural foods aisle.
Tofutti's non-dairy sour cream is also available in a non-hydrogenated version, called Tofutti Better Than Sour Cream.
Another option if you're looking for a sour cream substitute is to try your hand at making a homemade non-dairy sour cream using tofu instead of dairy. Here's one recipe to try: Vegan Tofu Sour Cream Recipe