Does anyone out there have reasons to use or not to use white lithium grease on firearms?

When I worked in an auto shop we would go threw tubs of the stuff and it worked really well. i know that its thick but it really leaves a nice thin coat if you do a once over before reasembly on firearms. best of all its about 5 bucks a tub versus 5 bucks a syrynge of firearms grease. Am I missing something?