I love the Sage, even though it is a heavy, and has a poor battery life. I don't think I will go back to 7". I still have the Libra H2o, but I never use it, although it is easier on my hands, because I prefer to read with a decent margin all around my books, and my old eyes need a decent pitch: the extra inch means an extra 30% real estate. Plus it has a yellowish screen even with comfort light at 0.
Also, I like to have all my library on the devices and 8 Gb is not enough (presently I am at 20 Gb available).
I love my Elipsa too, which I can't take with me in public transport, but which is fine while seated at home. I use it to read different books : most PDFs are not readable on anything less than 10" (56% more real estate than the 8"), though for some PDFs I need to read in landscape mode, half a page at a time. Conversely, some PDFs built for 6" devices are unreadable on 10" but ok on 8".
For some kepubs as well (I prefer kepubs to epubs), I need the Elipsa:
- its 1Gb RAM means some books that are not readable on the Sage are ok on the Elipsa
- some books have tables or maps or pictures or a complexity which need the extra size.