I've used TDP for a while now and I don't eat back calories on a regular basis. I also have my activity set on low.
When my calorie goal was 1200-1300, I might eat back 100-200 if I had a particularly heavy exercise day or did a lot of strength training. Usually got those extra in protein. Once I moved my goal up to 1500+ I stopped eating back at all.
I just got a heart rate monitor for Christmas that shows calories burned, so this whole year I've been using the estimated exercise calories on TDP and I didn't particularly trust them. I didn't want to eat back when I wasn't sure I actually burned that much.
But, that was just me. When I moved my calories up to 1900 for maintenance I continued to lose all the way up to 1750, so I might have been able to eat back more if I had wanted to!