The early dry 7speed dsg's reported mechatronics problems in plenty golf forums. As far as I understand, the design have been revised / altered, the fluids have been changed and there are no more failure reports.
I'm really happy with my 7spd. I was weary at first but decided to go ahead as the car is very young and should have all revisions from the factory.
The box is super smooth and the 7th really helps with the rpms in motorways
The box is limited to 250 torques, that's why you won't find it in higher spec engines
I'm same as you, really happy with my 7 spd and seems well matched to the 1.8 engine.
Seat changed the mechatronics oil at the last service free of charge.