[markom]

There is still no eink reader that would be good enough for all tasks and needs.

I would recommend using several adequate eink readers and tablets simultaneously that would complement each other.

e.g. Kindle DX is good enough for me, both outdoors and indoors, at reading pdfs, djvu, cbz, epub, mobi (with installed kindlepdfviewer thereon), but lacks touchscreen for handwriting and annotating (by typing) for pdfs, color, great speed at searching or cross-referencing etc. luckily I can simultaneously use Sony Prs-T1 or iPad to circumvent its shortcomings e.g. read scanned pdfs on Kindle DX but scribble, annotate those pdfs, use dictionaries and cross-referencing on Sony or iPad.