I never saw what the big deal was until I tried on one of my friends at a party... seriously, it's like walking on a cloud. At that point (last winter) all of the UGGs (especially size 7) were backordered until June and going for $400+ on eBay so I ordered a pair of non-UGG brand "sheepskin uggs" from Australia. I love them! They are a light blue/gray color and match my winter coat perfectly (real uggs dont come in that color) and look like the "ultra" line of UGGs. I only wear them under pants (jeans or sweats) and they are super comfy.
My bf found a pair of mens uggs on clearance at Dillards and bought them for $50 to sell on eBay. He got $100 for them
He tried them on and admitted they were very comfy but they are just not his style AT ALL. (His little bro just got UGG slippers for college though)