I've warrantied tools but don't break much any more. #2 philips is what I break the most of and generally its Snap On, either bits or my favorite hard handle. Snap On truck to the rescue for the hard handle, bits they will warranty also but I figure they are consumable. I need to find a truck when I have some cash in my pocket so I can stock up on bits. ACR bits will hold a screw horizontal to allow me to get it into a trough or a box easily.
Funny how a bit will last a long time and then pow, busted. I broke one the other day with a non fuel M12 milwaukee driver. It doesn't have shit for torque , not impact, but it Snapped it. Bet I've been using that bit in an impact for months.