Spent a few hundred miles in my mate's 997 MkI GT3 on an alpine road trip and it is a rocket ship for sure (great brakes too). The way it pulls in 6th gear is just scary. However, living with one would be a different proposition IMHO. The droney exhaust is loud but not exactly tuneful, then you've got the cabin boom to contend with, and that ridiculous front lip, which catches everything.
It's a thrilling car for sure, but I reckon you'd be able to find others which are just as technically capable and more of an event to drive for the £45k he paid for it.
The 991 GT3 is just crazy expensive. I think porsche (and others) feel the need to tack an extra £30-50k to the price just so that it doesn't "appear" to be too far behind the current gen ferraris with their telephone number prices. They're competing against yachts and light aircraft in that price category...