Gillymc I think arriving at that time you would probably never encounter any big delays, or the am arrivals. It's the afternoon arrivals that encounter the delays or this is our experience anyway.
We've arrived around 1:30 to 2:00 pm nearly every trip and never encountered a delay like Groove describes, but not wanting to either. Sometimes takes us around 45min to hour but sometimes less than half hour also. That's why it's a tough decision for us, could be a waste of money? Or the could be quite a bargain if backed up.
Jamb