Rant ahead : the color PocketBook looks nice, but I'll be harsh: their website is atrocious. There is a loading animation that takes seconds to run every time you click anywhere. You can't easily find any relevant information. The "where to buy" page simply doesn't work at all and display no stores, even in Switzerland, their home country. It seems impossible to discover the price of the products, too.
This is one of the worst site I've visited in years, really. It's plain terrible, obviously the nice look and animations were used to sell the website to clueless executive that never browsed the website, it's painful to watch such a train wreck. This site is a sure way to lose potential customers forever.
Regarding ebooks, I have a strict policy of buying only ebooks without DRM. That strictly limits what I can buy, but I'm adamant (some SF, and that's about it). DRM is evil and must die. So I can't use either Kindle hardware nor app. Plus I religiously use only opensource/free software whenever possible.