The tax can be all over the place for the C7, pre-facelift has higher emissions - so you won't like the tax, post-facelift pre-2017 is probably the sweet spot (you probably still won't like the tax) and post 2017 is an extra £325 per year until it turns 5, so again you won't like the tax
I've also heard that white ones can rust more
But that aside, my views are if you really need to scratch the itch then buy one, and when we are allowed, drive the thing
