I went last year with a 4yo. It was in the big indoor arena. I thought it was a good day, although the entries were pretty expensive and the PC mums slow to help when they needed the jumps changing for the next class etc. - I went in and lent a hand and they're nothing to do with me!
Cheers for that, we took teenage daughter and pony on Sun and were hanging around for hours for 2 classes, very frustrating day, great experience for her in that arena tho, she loved it! Was wondering if it was just me being a whinger 'cos it didn't seem to be very well organised. Never mind, I guess they did their best.