I could geek out about ipods for hours
Ive got several, these 3 are currently sitting in front of me at the desk
Left: 6th gen, running RockBox, 400gb sd card conversion
center: 5.5 gen, full clear case obviously, 400gb sd card
right: 7.5 gen, 512gb sd card
Ive got a couple others that work, plus a full case full of parts for building or fixing them. Used to fix & sell them on ebay 5-10 years ago. Just sold one to a coworker last week actually.
I use the RockBox'ed one every day in the garage, but i use a FiiO M6 in the truck or at work, because Android/Bluetooth.
Why? Because i prefer to own music instead of streaming it.