A bloke at work (a really pedantic physicist) has got an Exeo with the 170 version of the 2 litre.
He rang them up & asked for some kind of data & evidence that the performance/fuel consumption etc. won’t be messed up by the fix. They wouldn’t provide anything. He also wanted some kind of reassurance that it wasn’t going to cause damage over a prolonged period that won’t be covered by Seat. Apart from saying it won’t cause any problems, they couldn’t make any assurances, so he didn’t bother with it.
We’ve had the letter for our Ibiza which has got the 140 version of that engine.
We haven’t gone with it.
I did a search and found a forum full of people complaining that the 140 2 litre ran a lot rougher after the ‘fix’, rattled a lot more at low revs & seemed to have lost torque at the lower end of the rev range.