There are a few things to know if you are going to use a Lenovo s21e with MX-15.
1. The installer on the MX-15 isos cannot use the long device names of the internal eMMC drive in the machine. Do a dist-upgrade with the live media before attempting an install, as the installer was upgraded after MX-15's initial release.
Depending on which VPN client you use (OpenVPN handles this correctly), you may experience this problem. This may be solved by disabling the firewall, since not all VPN clients are able to negotiate it.
Installing a snapshot iso to hard disk produeces an error when rebooting/powering off, "a startpar error, usually related to rsyslogd or rpcbind or some other service not terminating".
MX-15 as shipped comes with a combination of pepperflash (Google's special adobe flash) along with the freshplayerplugin (which allows pepperflash usage in firefox).
This is great for the most part. Firefox gets a fully up-to-date flash.
Unless your favorite website still uses adobe flash drm components. In the USA, the big culprit is Hulu, the streaming TV site. If you try to launch Hulu in Firefox MX-15, you will get a warning about updating your flashplayer.
user reported an issue when selecting partition during installation.