In theory they sound pretty easy but can be a total nightmare-especially if it is a bad controller. I have been scared two times that I remember and they were both bad wx doing a par in foreign countries.( naval stations in spain, italy,turkey) Usually it is a young controller and they think the faster they talk the better they are doing. I also think we screw them up in a heavey airplane as we are not responding as quick as they are used to. I have had some on the other hand that were pretty good. Honestly I would almost rather do a NDB approach than a par with a bad controller. I have had some into Norfolk NAS where we broke out at 250 feet in what would normally be full scale on a vor or ILS.