Not sure I agree they are a minefield. Main issues are the chains and the haldex. Both very expensive, yes, but some good remedies are available to fix those.
The chains are only an issue on cars who haven't had them done and 2010 engines (there is a thread on here with exact engine serials for affected cars). If you go to VX it will cost anywhere from 2500 to 4000£ but Nick150 on here can do it for less than 1500£ I believe.
The haldex - well that really is a lemon. But thorney motorsports have an upgrade/rebuild solution of the unit which is only 1/3 the cost of a new unit and which will accomodate a lot more power.
Rust - here in Denmark there was a recall of early models (but only '08 and '09 models) to have the rear wheel assembly removed to improve rust protection in the rear 1/4 subframe, but that should not be applicable to any VXRs.
In general, you should try to avoid previously tuned cars - it might have been done by reputable tuner, but if the guy driving it has been driving it pants on fire, it could very well be completely wrecked - but that is true for any previously tuned car.
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