I've been fortunate enough to drive one, it doesn't take much for it to bite back. The clutch is like pushing a ton of lead, the gearbox is a bit of guesswork, and steering feels like you're in a battle with the Tyres, and it squeaks and rattles a lot.
Not as bad as the Testarossa though, which goes down as one of the worst cars I have ever driven, (and I've bought and driven some shite). When you get in and the instructor tells you, it's goes like stink, but it weighs the same as a container ship, it's about 7 foot wide, doesn't stop, and doesn't do corners.
The first time was at the end of my road between Lancaster and Garstang on the A6. He rear ended an old dear in a Metro who was turning right, the F1 went under the car and tipped it onto its side. Lots of the young lads from the village have a piece of the carbon fibre from 'Mr. Bean's McLaren' as it was known at the time. The man himself hid in a kebab meat wholesaler's premises nearby for an hour or two until he left.
In terms of value they tend to go for between $1m and $4m on the open market now, so £650k undervalues it significantly.