These guys have a sense of humor picturing a V10 M5 and saying 'better than money in the bank, great to drive and fun to own'.
They've not ran one outside of warranty otherwise they'd know it'll take the money you have in the bank and apply for an overdraft via the Idrive without you even knowing!
If you don't drive it, it will be better than money in the bank but unfortunately it's unlikely you can keep your money and enjoy driving it at the same time! It's a proper supercar engine and gearbox with the associated costs hiding out under that saloon body.
Bloody awesome cars when a proper exhaust is fitted, would still have one if I could!