Its going to be awesome to be able to clear the clutter from my desktop and use the rechargeable keyboard with my iMac, with the battery life its also going to be great for the road for my iPad as well.
I'd use the new mouse and keyboard with my iPad air 2 and eventually with my macbook. They seem fast and comfortable, my macbook is old and the keys are failing very often.
I've been toying with the idea of picking up the Magic Trackpad 2 since it is larger and I find that I have an easier time using the trackpad on my Macbook Air than the mouse with my iMac when trying to make precise edits in some of the technical drawings included in the technical training packages I produce for my company. I think the larger surface area and the Force Touch could make a measurable difference in my workflow.