my brother has a blobeye wrx sl with leather seats,
there fierce comfortable seats but you do find yourself sliding about a bit on a spirited drive on a twisty back road......
iv got factory leather in my wagon and have to say i love it ,it is a little slippy when driving hard but nothing mental and using proper cleaning product for the seats really reduces that and the comfort is great
never personally tought leather was something for a sccob if it is in it well then yes but retro fit i would never bother
plenty of other things to spend your money on in your car