Pen seems alright, battery lasts about 2 weeks of hard daily use, did notice that sometime the x360 I'm using it on either doesn't recognize it or the MPP loses communication with the x360, but the writing is jittery and not legible until you pull the pen back from the screen and try again
Works as expected. However you can't know the battery level (the gap app can't determine its level you have to refer to the light that flashes when it's low batt). Battery it's slowly draining when not in use, probably due to the fact it's being connected to the laptop.