IDK, I found that the PP or PPP in a modified otterbox case was fine in a pocket but daily driving a PP even with the extra battery in the PPkb was still crossing the line of too much for me too often. It made me realize that I didn't want a paperback book sized item in my pocket anymore. This said as a former N900 Mugen cover/Double-Scud battery user. The PPkb also doesnt have the tactile click response we loved on the N900, I am a blue kb switch kind of user,I like the tactile feedback to know I have made the keystrike. If I had another PPkb I would probably not use it everyday, but with full support in system we would really have t see if that were true I suppose.