sailfish is nice on thr onepljs x. well, spelling doesn't work yet for me as you see I think it's a missing library that I can't find to install.

for slipperiness -- it's glass front and back if you get the black one -- I use a poetic case which is clear plastic with rubberized bumper strips that help with grip. also availible is a white version which I believe is ceramic on the back and less slippery and like 30g heavier.

i've made no attempt to use sfdroid and android apps. (I've read about people using whatsap online but I've never figured what I'd do with it.)

depending on what os the x ships with, installing sfos can be a tedious process. Check the oneplus forums about this if you haven't already.

the size is about as big as I can use. it fits in pants pockets, unlike the oneplys one which i tried first.