HI!
I use a c5060 in a pt020 and I am VERY happy with it.
I have been using it for over 12 months with scuba, and have never had a problem(although I have read reports of floodings, electronics failures and so on - I have yet to expience any such problems).
I actually just one a few prizes in a competition using the system.
If you'd like to see 'hands on' imagery I have taken with this system, go here:
www.underwater-photography.info
and view 'Keir Davis' gallery.
I have been on a learning curve with the camera, and started to actually take RAWs starting about 6months ago - even so the earlier Jpegs are astounding (IMHO).
As yet I have no strobe, so all flash is in-camera with inbuilt diffuser . . .
Enjoy!