having a mouse that doesn't stay connected is extremely frustrating. Iam going back to my logitech nano mx...which has been a reliable mouse.
does not require a usb dongle; works on existing bluetooth wifi card on your ultrabook/notebook (ie frees up a usb port
continually disconnects requiring full unpairing continually sleeps requiring 10-15 seconds to turn on not ready for market (using intel-AC-BT 4.00) with all recent drivers...advanced user