Well this is my second JCW, I had an 06 too, super charged version, was far more thirsty tho.
This returns between 28-40mpg depending on how I've been driving it. It's fairly comfortable for everyday driving, it's got more than enough power to see off rep mobiles and most other hot hatches, it's tonnes of fun round the back roads, it sits well on the motorway.
Downsides, the size of the boot which doesn't effect me personally as all I really carry in the boot is my gym bag and my laptop or a few overnight bags if her and I go away for a few days, also the image, I get slated for it in the office.. 'is that your misses car?', 'are you an estate agent?', 'hairdressers car' etc but tbh I'm used it now as it's my second one.
Equipment wise, iPod/iPhone connectivity, Bluetooth, air con, half leather, bi-xenons, JCW suspension which is a rare option but the owner before me seemed to spec this over the likes of the aero kit or JCW wheels or the JCW 4pot brakes.
All JCW options on this car have been factory fitted, this makes it more desirable as dealer fit JCW upgrades seem to have a bit of a stigma attached to them in the mini community for some reason.
As per prev posts the car is fitted with run flats which are horrendous on nothing but dry smooth Tarmac, but they'll soon be gone for some conti sports or the likes, coupled with some eibach or H&R springs like I had on my last one which turns it into a 200bhp go-kart which was on par in the handling department as my old R27.
Anything else you'd like to know let me know mate.