My brother in law had a GSI and under 35k iirc it needed a new turbo. I understand its a reasonably common fault.
Woman who works for me has a 1.6 or 1.8 petrol (not sure) poverty spec thats had a handful of problems but most notably 2 new ecus in under 18 months which manifested itself in an intermittent cutting out, usually on roundabouts or somewhere equally concerning! Would just die, then just turn over and not fire, then fire up and be fine for a few hours.