2 weeks ago my buddy at the Motorcycle shop was having fits trying to grease his dump body plow truck before a big snowstorm and for some crazy reason 2 grease guns he had just weren't cutting it and we started talking about the cordless ones.
He said someone he knew told him that they sucked at least one this person got at the TSC store

Lincoln maybe? Don't really know what they do sell never much looked. Can hardly stand to go in there most times. I do get grease there though sometimes
So I took the M12 grease gun I use for my tractor/loader to the shop today to show him and we greased the dump. 2446-21 kit
He really liked the ease of it and I think he is sold on it. I mentioned the M18 version has more features but the longer hose was about all he was interested in though.
I have to find the best price. I think I paid $154 for a -21 kit (was a while ago definitely more than a year) but I think I can get him better than that now. Will need a kit though he has no Milwaukee cordless tools at all.