I think I used this more as a pillow for myself than anything....oh well. But when it wasn't a pillow for me, it was a comfortable spot to lay my son. It would prevent him from rolling over and he always seemed happy to observe his new world while laying in it.
We had two of these in our house. One in our room where he slept for the first 6 months and one downstairs to use as a napper/play area. With limited floor space, this was amazing for tummy time and play time overall.