My G revision lasted the best part of 1 week after my stage 1 remap by Jabba, before it let go - engine warning light and turbo limp!!
Changed it to a D revision from Awesome, and has been fine since! I would never go back to a diaphragm type! Best to go Forge IMO!
EDIT - I might be confused, basically the diaphragm type which came on the car (2005) lasted a week after the remap. The piston type is still going strong!