i used to race, and waxed my skis religiously. But honestly i have waxed my twins once, and their fine. unless you're super worried about speed, and you're mountain has a lot of flats, than i wouldn't worry about it too much.
but i used swix for racing, its a little pricey though but super fast
"If the definition of nigger was a small plant that gets stuck to your clothes. "I have niggers all over my socks." That would make sense." --JakeAssBeatClap