Amazing!!!
I purchased a South West 55 and a Versa Fanny pack, as well as several other accessories, and I have to say they are fantastic!!! I moved to a UL backpack from my tried and true Gregory Paragon68, and I haven't looked back... I use the Versa almost every weekend when I take my kids out and in conjunction with my Southwest for snacks when I backpack. It's got a little over 100 miles on them now, and I haven't had any issues. I love the lightweight and its simplicity. (I would sometimes lose things in my Paragon, once my rain gear and another time my toiletries kit, only finding I had them the whole time in my pack)