535d remap advice - pre LCI model

[S8QUATTRO]

Hi guys, considering a 535d as a daily driver (80 mile commute), heard lots of good things but have not driven one yet. Would be a pre lci model with 100k plus miles..

Would you remap an older car with higher miles?

Can the gearbox handle it?

What kind of real world mpg to you see on a remapped 535d? im not that fussed but 350bhp must be juicy

Any major known faults with this model/engine? Are they that good? or is it a ph joke?

Thanks all,