The Kindle Oasis is the premium Kindle, so I was surprised with the problems I've experienced. When I first received the Oasis there was a permanent dark spot located at the centre of the screen. Amazon sent a replacement with no issues but recently the replacement also developed a dark spot! Again, I was sent another replacement. Unfortunately, the replacement device had a pin sized bright spot and was also registered to another user (light tears and bright spots are common with front-lit E-Ink screens <1>)! I speculate the replacement was a returned device from another customer due to the screen blemish. Amazon then sent a further replacement – this replacement was near perfect but had a barely noticeable permanent dark speck mark at the top of the screen. Thankfully the speck doesn’t affect the reading space, so I kept the device.
I also had a recent issue with an Amazon Fire HD 8 – but this is expected considering the entry-level pricing and cheaper screen. The screen developed a pressure mark – a common occurrence with LCD screens – and was swiftly replaced.
These are only two recent examples of quality control issues I’ve personally experienced with Amazon devices. I am not alone and similar blemishes are reported by other customers in their reviews on Amazon websites. Maybe it would be less wasteful and more cost effective if Amazon paid more attention to quality control.
The positive, from my personal experience, is that Amazon respect their warranty cover and do not impose unnecessary measures to test the legitimacy of claims.
<1> I’ve had the same issue with the Kobo Aura One. Kobo sent a replacement but I had to first post the original device to Germany from the UK (Kobo, when I contacted their support, stated they don’t provide prepaid return labels). The Aura One replacement was brand new; to contrast, Amazon tend to send refurbished devices to replace defective ones. To be fair, the refurbished replacements I’ve received were in near perfect cosmetic condition; the only issues I’ve experienced were screen blemishes.