These fell into the "why bother?" category for me - they are really a different taste and texture from regular pasta, rubbery and gooey. I tried them several different ways and ultimately decided they're really not for me. I'm not someone who uses replacement products for low-carb foods, though, maybe for someone else they'd be really helpful.

I think the amount of potato starch or tofu is really negligible (like under a tablespoon for the whole pack) so everyone needs to make the decision they are comfortable with on that front, but I've read that the texture is improved when ingredients other than just glucomannan are included (didn't make much difference for me personally, but they just didn't click for me)