We'll I have had a good drive of the 35i this weekend & what a difference the new turbos have made, firstly it's so much quieter & its now brutally fast
I guess you don't notice the gradual decrease in performance as the old turbos wear.
Although 110,000 miles is good for a pair turbos on a n54 it's still big money for 'wear & tear' maintaince items. If manufacturers want to go down the road of turbo engines & can't provide turbos that will last the life of the car they should at least install them somewhere they can be easily changed.