The Sage is OK and the shortcomings of battery life are overstated.
I bought (in this order: Original Aura H2O, Libra, Libra2 (the Libra buttons are more reliable), Original Elipsa and then Sage to have a handier size notebook. But I only read on the Sage. I gave away the Elipsa to a relative recently. I've loaned out the Libra 2 to someone that lost the Sage.
I'd use the original Libra only to read out loud for recording as it has reliable page turn buttons.
If you want small, then a TCL Nxtpaper 40 (4g, not 5g and under €200) is good enough battery life and better than small eink such as Sony PRS350 or Y-ben P47L. If you want big then the TCL Nxtpaper 11 (about €240) beats the reMarkable, Elipsa, DXG (I've had all of those). Or maybe the Nxtpaper 14. Those have good enough battery life for ereading and longer run time for audio books. Also true paper-like matt and full real colour. I use sRGB setting and no "reading modes".
I saw a €450 nearly new colour eink (Kaleido 3) Onyx Boox and we both thought it looked rubbish compared to Sage or Nxtpaper.
The eink is only better than Nxtpaper (LCD or OLED models) in enough ambient light for front light to be off. I'd only use "auto" brightness outdoor. Indoor the 10% to 15% manual is better. If you think you need darkmode, perhaps the brightness (eink frontlight, OLED or LCD backlight) is too high. Whiteboards and white paper works better than blackboards and black paper. Also I remember black background CRTs which was because of lack of EHT regulation. Later white background with flat matt screen (not IBM goldfish bowls) CRTs were far better.
I've also seen photos and videos of colour ink. None are good enough and affected by what you viewing on. You need to see it in real life.
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