I was really asking to gauge how difficult the study (and exams) are. I really enjoyed doing my PPL study and exams, I had forgotten how rewarding it was to absorb new material. The only subject I found totally uninspiring was Air Law. Ironically I was recapping my Air Law over the weekend becasue I had gone rusty on rights of way (on the ground), minimum heights and whether to use the quadrant rule when VFR at 4000ft...
It's tempting for me to do the CPL or ATPL exams as a learning excercise which would also improve my knowledge in flying. Who knows, at the end of it I could even think about going into commercial flying.