I’ve got the craftsman version. It was cheaper and I already had a craftsman 12 V batteries. The craftsman next tech is identical to the Milwaukee only a slight difference in the battery shape.
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One major difference I noticed between the Milwaukee in the Craftsman jacket that I have is how thick the Craftsman jacket is. It’s such a heavy coat that you really don’t need a battery pack but when you use it it retains the heat extremely well. Sometimes I would like to have a lighter jacket like the Milwaukee and have the option to use the heater. When it’s super cold in the craftsman jacket is always enough. I also have the cable to hook it into the 12 V socket on the dash.
They’re probably not even for sale anymore and one day I may have to use the Milwaukee battery to power mine which will be no big deal. I still have 6 12v craftsman batteries and several tools....there may be a aftermarket battery available