Yeah the LEDs were always handy to have, and the coloured notifications on the trackball (nexus 1) with a third party app was super cool at the time. My trackball after a few years got pretty dirty and didn’t want to clean with chemicals in fear of damaging it.

Currently using a Nothing (3) which is somewhat similar with the small led display on the back.

Nexus one had the trackball, the hero had a sensor or did both? IDK it’s been some years since I still had my nexus one. Maybe I’m thinking of the HTC Desire with the sensor.

I do remember running the original version(s) of MIUI on my nexus one, ahh simpler times.