A few niggles to start off with - needed new brake pads, which were cheap.
3 weeks and 1800 miles later, at 147500, the cam-belt snapped, despite only being (incorrectly one presumes) fitted at 146000. Got £400 pay-out though.
A heap.
M.O.T was due very soon, and it needed £200 of welding so I suppose the belt snapped at the right time!
Swore I'd never buy a Sierra again, so my next car was... another Sierra.
On a 1600 Pinto engine the valves and pistons "miss" if the belt snaps. Had you installed another £15 cambelt, the engine would have almost certainly started and run fine, and rattled on for a good while longer.
It's an easy job on these cars too as it's right at the front of the engine bay with hardly anything in the way.