I used the CRP5 for the JAR exams. Gave it back to the person who lent it to me (thanks). It's good for exams but it just isn't practical (in my opinion) for every day use. Mainly because it's too big and you can't stick it in your pocket.
For my Australian exams I used a small pocket sized Jepp like whizz wheel. Very accurate, easy to use and fits in my shirt pocket. I used a CRP1 for the PPL and the other one for the CPL and ATPL exams.
For work and play I used the small whizz wheel.