Nexens are a hit and miss - but the poor support/accountability from Mintys is simply not worth the trouble.
Had a new set of Nexens fitted on the X6 and they just couldn't get it to balance properly after several attempts. Blamed everything from the car, to the wheels, and even my driving style!
Eventually got an independent report from elsewhere using RoadForce equipment to say that the tyres were indeed defective - this was at my own cost as well. After weeks of fighting, they eventually agreed to give me a refund and I opted for a set of Bridgestones (paid in the difference) - with zero issues on the Bridgestones.
So sometimes it's not about the cheap tyres only - its about the ability to support when there are issues.
For the record, I bought other (premium) brands from Mintys - no issues, other than the sh!t Nexens.