I have 260 deg poncams.
There is a slightly lumpy idle but it idles fine.
The car was shimmed to 0.45mm but this has created slight lifter noise. I would go with a skinnier clearance. Some people have checked it and left it factory shims (I don't know what clearances they end up having).
The 260 deg seem to make the car better everywhere but I would still suggest you will get better value for money out of turbo selection/change. At the time that we decided to change them there was conjecture about the lift and duration of the factory cams so I sucked it up and changed them.
Factor in labout to get to them, removal, new cams, new shims ($200+) and tuning vs new sexy time turbo (sorry watched Boral last night).