Using it daily since Birch times. With Birch I carried a (powered off) N900 as backup but stopped that when switching to an early Evergreen device.
I’m usually carrying a power bank (Mazer EnerG Duo 10C) when expecting to be outside for > 6h (the Evergreen battery lasts longer than that but this leaves me enough safety margin) and a Zendure Super Hub when travelling (instead of a charger) as it has a long connector cable to the hub so I can use about any power socket location and allows me to plug in a HDMI screen, TV or projector (used for giving presentations (e.g. Debconf, FroSCon). When using it as Laptop replacement (e.g. on shorter train rides) I use a Nexdock 360 (but the would like to switch to s.th. with a better touchpad).