Should I buy UGG boots?

I don't know. I'm vegetarian, have never owned anything leather/sheepskin or anything, and I'm pretty much fully against UGGs, but I really want a pair of their boots! All of my friends, I mean everyone has at least one pair, and they understand my not wanting to wear them, but, I just really want a pair! But I'd feel guilty buying them. I considered the yarn ones, but those still have leather in them. Advice??