At home I use mostly Craftsman, except for my Makita's. At the shop we've got mostly MAC and Snap-On, but that's because we have one helluva credit line with them, and they stop by once a week. =)
For home tho, I have yet to find anything better than the Craftsman replacement warranty, for the same reasons as ppl stated. When PuckPuck had a problem and I didn't have the "proper tool" we just improvised... It destroyed the tool, but who cares, it gets replaced free, right?

E1