I've tried them and they taste just fine. I particularly liked added sauteed carrots and green onion and tossing it all with a home-made peanut butter sauce. That being said, in principle, I"m just not that big of a fan. Sure, they have zero carbs and zero calories... but they also have zero nutritional value. It's the nutritional equivalent of munching on styrofoam. Even the ones made with tofu that I've seen tend to have very little protein per serving--maybe 2 grams or so, and not much else, nutrient-wise.
If you're looking for a good, low-calorie, low-carb substitute to pasta, I'd recommend spaghetti squash every time. For a half-cup serving, Fitday lists it as being only 38 calories.
Starting over for the last time.
Start Weight: 141 lbs
Current Weight: 139 lbs
1st Goal Weight: 133 lbs (7/21)
2nd Goal Weight: 125 lbs (8/31)
UGW: 115 lbs (11/20)