Bought to replace a stylus on a surface pro 4. I was amazed at the response and pressure sensitivity the Ciscle brand pen had over the Microsoft-provided pen stylus. The pen was ready right out of the box, with just an insert of the new AAAA battery. No need to pair or anything, instant recognition by the surface pro software. Recommendation is to supplement the pen with a soft rubber grip, as the pen grip is much to hard for extended, repeated use. Only reason why comfort isn't a 5. And the only other issue is the reduction of 1 button from what is provided by windows pen. Although, I am saving a small bundle on AAAA batteries. The Ciscle pen has a auto turn off feature that is active after non use of an hour. And passively awakens at any second notice. almost no lag. if your looking for a new stylus to replace your old windows stylus...you found it.