Even as late as 2019, when I collected my Plus 4 Aero Racing Exhaust system at the Factory, and then returned to have the ECU flash applied, I received excellent service from start to finish.
The only problems I've really had is a sometimes long delay in supplying parts. In 2013 when I ordered an over-rider kit for my previous Plus 4 via the dealer, at a time when such kits were part of every day production, I think it took about six weeks, and a lot of prodding and poking.
DaveW '05 Red Roadster S1 '16 Yellow (Not the only) Narrow AR GDI Plus 4