Ieuan,
We have a Fox, which we have pretty much completely rebuilt fromt he ground up. It is not a bad vehicle, but it is one which needs a lot of care and attention. There is not much modern technology in there, it's all fairly basic. Its is however very crampt and it wouldn't have been possible to fit more modern equipment in the turret as it has been with the CVRT. The engine is a weak spot, but the gearbox seems to be the main problem with them. Most former Fox crewman have fond memories of them, most former REME guys didn't enjoy them quite so much!
Chris