My Lenovo Yoga 500 is slow as hell. There is no backup of the OS, and when I searched for OS disk sold separately, I’ve found that Lenovo no longer sell OS backup disks for that laptop, and I cannot reinstall Windows on my laptop, because Windows OS from Microsoft site differs from the one preinstalled on my device.
I though before buying the laptop to risk getting it with 4Gb memory, and I scheduled a memory upgrade later. But I had to learn that almost no way to upgrade memory, because it just doesn’t work with the 99% of consumer memories.