I had one with a friend that I haven't ridden with in about a year, she said I look so much better on a horse now, and she couldn't see any faults!
We did a jumping lesson and the instructor commented on how much stronger I am in my position since I first started learning, and how much I was improving through the lesson.
It was a very chest swelling lesson. :)
Even if the pony I was on decided to charge off at one point and follow the other horse over the jump...LOL!