Acme has lots of various deals going on for both brands pretty regularly and during the Holiday season is when I work on getting various products for work to increase my bang for the buck with my tool allowance I get from my job.
I bought some adapters to fit the old Dewalt 18V stuff to accept modern Milwaukee 18V batteries. It was pretty cheap. This surprises meI have a relative who went the adapter route - They sure know what they want for those stupid adapters. Good grief.
I'm a Milwaukee guy. I'd hate to switch over half way through a collection. $$$$$$