[QUOTE=But unfortunately the Sage is pretty much a sidegrade compared to the Forma while having worse battery life and a considerably higher weight. Also I am reluctant to again spend 300 bucks for a reader that maybe again barely survives 3 years unscaved. The Libra 2 has a very pleasant price point but lacks that one inch of screen real estate which I guess I would miss when reading PDF magazines. And the Elipsa is probably a little to big and heavy. So no real easy upgrade option. I actually only want a Forma with USB-C and maybe a bigger battery

[/QUOTE]
I think you should go for the Sage. While the battery could be a lot better, I probably get a couple of weeks on a charge with daily use, and USB-C means it takes next to no time to charge. Even if it's a bit heavier, it's still not that heavy, and it is noticeably faster than the Forma. Screen is nicer, too.