I'm planning an ultralight thru hike for 2016. My base pack weight right now is about 15lbs. I've managed to acquire everything I need but I'm on a pretty tight budget and would rather save the money. I'm in good shape (170lbs, 33 years old) and I'd like to hike the trail a bit faster than usual (don't know if that matters). I have a fair amount of hiking experience but only over long weekends. I've never used them before and am not opposed to getting them, but I'd like some perspective from both camps if possible. Thanks.