Like the other guys say, it's tasteless (gotta rinse it first, they come out of the bag smelling like bad fish), so it depends on the sauces/spices you use. I like it with a Thai Peanut sauce and chicken, egg and peanut mixed in, tastes like a thai dish without all the carbs. Good for asian dishes IMO.
I don't think Miracle Noodles are a good substitute for wheat based pasta like linguini or spaghetti though, completely wrong texture.
You can get them 25% off at Amazon right now with Subscribe and Save and a coupon code on the product page, pretty good deal at <$2 a bag (4oz serving).