When I was choosing an e-reader for myself some time ago I bought both PocketBook Era and Kobo Libra.
Kobo asked me to create an account during the first boot which I hated and that was pretty much it for Kobo. Now, I'm not saying this is unskippable because I honestly don't remember the details but somehow this made me not like it.
PocketBook has an awesome build quality. Certainly better than Kobo. It feels very premium and durable despite being pretty slim and I'm not afraid of throwing it into my backpack (with flip cover). The lack of handle curvature (like in Kobo) may be a slight disadvantage in ergonomics but it makes the reader much easier to pack and carry around.
As for downsides, PocketBook's software is slooow. Just flipping pages is ok but switching books, jumping around or going through menus is just unbearably slow. Good news is that Koreader solves this problem completely. It flies and is better anyway.
In the end I'm very satisfied with PocketBook Era and I would buy it again but Koreader is a must.
Wow, thanks for posting this. I actually considered switching to PieFed because people say a lot of good things about it but now I know I won't. I can't treat codebase like this seriously.