Because it was our first meeting, Sally arrived earlier than her 'start' time to allow for a quick introduction/handover, and so I think we were out of the door ahead of schedule which is always a bonus!
We felt very confident leaving Sally in charge of our 4yo and 3yo and didn't have any concerns whatsoever throughout the night, so we were able to relax and enjoy ourselves. To us this meant it was well worth the (modest) fee to have Sally babysit for us.
I'm already looking forward to our next evening out, and Sally will be the first babysitter we call.