Bought one second-hand which had been sandblasted, ran it since January. Very good overall and did the job. It has however cracked in 2 places, so waiting on another second-hand one getting delivered to replace it. I'd be annoyed if I'd bought them brand new. I run the boost at 1.2 bar, so that might affect the lifespan. Haven't noticed any measurable power loss from the cracks, boost holds consistently.