- you can only sync using mobi and now you have a completely crippled book with horrible formatting; Other brands of e-readers don't have sync for any format o

- you can only sync using mobi and now you have a completely crippled book with horrible formatting; Other brands of e-readers don't have sync for any format of side loaded books. - want to see the cover on your sideloaded book? You need to either use it offline or use calibre workaround disconnecting the usb and reconnecting after sideloading it. Don't use AZW3, instead make your books KFX with the correct amazon id and you won't have to worry about covers. So, if you’re an unorthodox user, do yourself a favor and buy any other brand of ereader. God knows whatelse amazon will do to nudge us into their walled garden on the years to come Amazon does suck, but the Kindle hardware is the best in the business. Kobo has some nice software features, but their hardware kinda stinks. The Forma and the Libra H20 both have terrible lighting with a giant dark band on one side. The Nook is a joke that Barnes and Noble stopped caring about years ago. Boox violates the GPL by refusing to publish their kernel sources. I'm unsure of the hardware quality because I've never know anyone who's had one.