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I'm gonna be boring here and say iPhone. I know it's old hat at this point, but sometimes I think back on how I used to have a phone, digital camera, iPod, GPS, etc. and now I have all those devices - and so much more - in one device that weighs a few ounces and slips into my pocket. We all take it for granted now, but it's still incredible to me when I stop to think about it.
 
iPod 5G or iPod 10G. The first generation iPod, basically. It had that awesome spinny jogwheel, which was just intuitive and fun to play with in a way that the touch based wheels weren't.

Microsoft brought out a Cortana speaker that had a wheel like knob to control volume, and it's IMO the best volume control on any smart speaker to date. It sure as anything beats the Homepod Mini's touch buttons that you can't see.
 
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