The phones are great but quite heavy + thick (at least the phones I saw).
In my case, the phone isn't thick enough. I had problems with it slipping out of my pocket (I once went back to the car looking for it to find it on the ground getting rained on), so I added grippy skateboard tape on the back.
If I change phones, I'd do it again. Why not just buy a case? Because to get a grippy case, they're too grippy and will hold onto the cloth in my pocket when taking it out. The skateboard tape is "just right".
Someone ought to produce & sell grip-tape with die-cut patterns in it. Peace-symbol, happy face, Totoro, etc.