I like quinoa, but until I've shed all the excess weight (another 18 kgs or so), the only carbs I'm eating are veggies. As already advised, the best thing to do is try it for yourself and see what your BG meter says!
Every one is different I agree but quinoa (which I love) is high protein and not that high a carb which is why vegetarians often use it a a key protein. A small amount is very fulfilling and sustaining. "A gift from the Aztecs" I have heard it described. Definitely try it, there are some delicious recipes out there.