Seller swears the car is fault free, should I still pay for a check?

[alarictreffry]

I found a California T that ticks every box and the seller is adamant there's nothing wrong with it, full service book, recent clutch, the lot. Normally I'd take that at face value but I've been burned before by a car that seemed perfect until the first big bill landed, and on something like this those bills are not small. A mate reckons I should arrange Genuine diagnostic checks for a used Ferrari in Al Quoz before I commit, since a test drive only tells you so much and the fault codes can hide behind a cleared memory. I'm tempted but I'm also wondering if I'm being overly suspicious of a decent car. Has anyone had a report come back spotless on a car they were nervous about, or did it always find something? I'd rather go in with realistic expectations than assume the worst or the best.