hi
its hit and miss, unfortunately, some people get problems, some don't
I've had my S-type R for 6 years and never had any problems what so ever, though its well looked after
the electric park brake works really well, you just apply it and pull off when required and it releases itself
these cars are getting old now so lack of maintenance can be a issue
but try it at least a dozen times, big problem can be a low battery that can cause issues, also damp in the boot can make the park brake module fail
cheers
Joe