I love my kindle paper white. It has great battery life, and is a convenient size to just throw in a bag or my back pocket.
BTW, I purchased the discounted "sponsored" version that shows ads but employed a minor "hack" to turn off the promotional messages.
I also don't purchase any ebooks from the Kindle store (which makes those promotional messages particularly pointless and annoying) as there are plenty of legitimate sources that provide DRM-free ebooks in standards-compliant EPUB format that I can back up on my own computer in perpetuity, and transform into Kindle-compatible MOBI files on demand for transfer to the device via USB.