I have a 55-plate 407 and it has been the most unreliable car ever. The 508 is its replacement and there is no way that I would touch one of these. The engine is superb but the electrics are appalling. This is not helped at all by the dealerships being totally inept. Last year my car went in to the dealers AT LEAST 25 times which was less than 1000 miles before problems. Failures on my car include
Tyre pressure sensors (valves made of softest metal that corrodes away to nothing).
Parking sensor ECU replaced.
Parking sensor x2 (me and my son had to diagnose those as dealer couldn't)
Locking wheel nut sheared off (garage had to get wheel off)
Central locking failed twice no fault or reason found!
A brand new key from Peugeot was faulty (took 3 trips to get the key programmed to the car)
Windscreen washer jets knackered.
Wacky wiper fault that destroys the blades (needs 2 new wiper motors as transient suppression diodes buggered). Open the door and the wipers activate smashing into each other.
Then you have the centreless wheels that take forever to fit new tyres. NEVER AGAIN haing a French car.