Isn't the trekstore just 4"? I had a sony prs 350 and now have a kobo aura. Despite being 6" the aura is only marginally bigger than the sony. There are better e-ink readers then the aura, but it is a very small device, has 6" and frontlight. The Trekstore has no frontlight and not a very good display.
Think about how big/small your reader should be and look for the physical dimensions, maybe you find some 6" that fits. Here for comparison the dimensions for the trekstore (4") the sony (5") the pocketbook mini (5") the aura (6") and the kindle pw (6") all in cm:
Trekstore: 8,5 x 0,9 x 12,8
Sony: 10,5 x 0,9 x 14,6
Pocketbook: 10 x 0,7 x 14,2
Aura: 11,4 x 0,8 x 15
Kindle: 11,7 x 0,9 x 16,9
The jump of the Trekstore is of course big, but that is only a 4" display. But the aura is very similiar to the two 5" readers.
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