I guess it depends on the purpose for the wide arch kit, as a show car/pride and joy it's a disaster, money pit and chav city. As a track car obviously the wider the better. That said it's probably nasty fibreglass that will explode in a wonderful display of filler and chunks the moment a curb is clipped.
Lot of love for the golf N24H, went to see it at last years nurburgring 24h and it's even better in the flesh :)