Still worked fine when I had it. Don't see why it won't work properly knowing the mechatronics has been replaced.

2nd hand Passat is worth if you can purchase it at 60k or lower for any 2014/2015 models.

For Passat that is out of warranty -

Clutch - about 2k (wear and tear, but new version can tahan very long)
Mechatronic system - 6k? Can't remember (updated version is reliable but may also fail)
Fuel Control Module - 1k+? Don't remember (will fail once, don't know how reliable is the replacement)
Water pump - 1k+? Don't remember as well (may need replacement over time)
Speed sensor - Rm300 per unit, total 4 (Will fail over time, but mine lasted 5 years also no issue)
Lower arm bearing - RM300+, don't have to change the entire lower arm unit (wear and tear item)
Absorber mounting - RM400+ (wear and tear item)

Get ready a sum of money if the car has over 100,000km