My new Mr Coffee Burr grinder and Zell metal cold brew filter have been great. I made a large jar Monday and still have enough coffee for tomorrow a.m. The taste is rich and smooth, almost like a mocha chocolate ice cream. I use a small Aerolatte blender to froth skim milk and stevia before adding the coffee concentrate.
I've got a Breville burr grinder and use a Chemex. Also have a French Press.
I haven't ventured out with beans. Stick with local roasters.
Not a cold brew guy, but will drink on occasion.