As tcm said, the walk back to the car test is brutally honest, use it when you plan to review. It works a treat. Smiling to myself = positive, wondering if I should have bothered = neutral and regretting the experience = negative.
It's that easy, I've used it since I joined here for reviewing. If you're honest you don't need to concern yourself that others might disagree, I don't.
No refund and I'll bet she weren't cheap neither, no such thing as a bad day when you're charging over two quid per minute.
If she refunded you then that would be fair, but she didn't.
It's a red one for me.