I've got a 2014 3litre Sportbrake and is without doubt the best car I have ever had, and I've had some nice ones, inc Bentley Turbo, M5, M3, & numerous Merc's, and this car beats them all hands down, and it still looks like new.
Expect 35mpg around town and up to 50mpg on a run at 70mph
They go like stink, and I was so impressed by it I have recently got a mint XKR Convertible, for the summer.
£7000 Sounds a good price, & I have done 80,000 in mine without a spanner on it except for service items
Good luck