KIfaru makes great stuff and stands behind their product. The have a forum over off of their website that is pretty good for seeing the stuff in reviews.

I bought one of their KU5200 packs and it was the most comfortable pack I've ever worn but he ultralight stuff just wasn't for me. I decided I'd carry an extra pound or two to have a pack with a more durable material. I never ripped it but it was so light it scared me. I changed the way I hiked to avoid it touching anything. I'd rather be able to just plow through stuff and I am too cheap to see if it would hold up to that kind of abuse.