I don't have one, so maybe not being on the band wagon means I'm missing out on the awesome cuben fiber party or something, but here's my thought. I have a tarp (WB Edge) made out of Silnylon. It weighs ~10 ounces and cost me $100. Packs down real small, really dang light, and doesn't break the bank. For triple the cost, you can save 4-5 ounces. If you got money to blow, or the absolute lightest gear is critical for you, or both, go for it. For most, I'd say save the $200 and get your basic silnylon. Just my two cents.