I think at the end of the day you have to ask yourself if you can afford to have it break. (new turbo = 25k so keep that in mind).
If you're in that car and you're driving it you will love it. I wouldn't worry too much about the turbo as they seem fine on the 1.8T, the 1.9TDI owners are the ones that have to be careful. At the end of the day if you take that car at 115k and spend 50k on new turbos it will still be way better than something like an I20.
Also, with any Seat, I wouldn't buy one unless you plan on keeping it for a while.
If you're in that car and you're driving it you will love it. I wouldn't worry too much about the turbo as they seem fine on the 1.8T, the 1.9TDI owners are the ones that have to be careful. At the end of the day if you take that car at 115k and spend 50k on new turbos it will still be way better than something like an I20.
Also, with any Seat, I wouldn't buy one unless you plan on keeping it for a while.