The latest generation, Kindle Paperwhite, Kindle Scribe 2, Kindle Scribe 1, and Kindle and the upcoming Kindle Colorsoft, all have something in common. When you plug them into USB into your PC or MAC, they no longer appear as external drives. This prevents users from using file managers to back up their books or to sideload new books onto the Kindle. Amazon has also removed the download and transfer via USB option for purchased ebooks from the content page. This will likely prevent people from stripping the DRM from the books and sharing them on piracy websites. This is not
B&H and Home Depot have been two solid services for things they sell. Former is computers and photography. Both of them ship pretty damn fast.
Honestly, what convinced me to start using them was how increasingly difficult it is to get quality items on Amazon. Sifting through garbage gets old fast.