I had a Scenic 1.6 petrol, kept it till 94,000 miles. Main problems (as confirmed by Which car guide) - it ate through brake pads and tyres(not heavy on brakes in previous cars)- persistent binding problems. And poor servicing (fractured a spark plug, mis-diagnosed it as much more expensive ignition coil problem), oil leak after replacing timing belt as they screwed things back in too tight. But it was a conmfortable drive, loads of storage space, and the original exhaust lasted till I got rid of it.
Now have a slightly smaller, less cubby-holes but very flexible boot space Nissan Note 1.5 diesel, 63mpg, great torque, up steep hills in 4th gear, nae bother. £120 pa road tax. Which "Best Buy". So far, so good.
No experience of towing however.