I've had a Jeppeson for years and had no problems. All it misses from the CRP-5 is the mach compression conversion chart. Managed to get a photocopy of a similar chart which was tpared to the back for the ATPL's. No probs from the CAA.
Jepp costs alot less too!!
Now that I'm in the RHS of a TP the only time I use the Whizz Wheel is to convert Knots to mph for the pax.