Yeah, I've had a few different ones, w varying levels of cushion. It's kind of a crapshoot, so you have to cast a wide net. Easier to do when they cost under $20. It's a great feeling to be able to add gpt cushioning to your favorite shoe.
Currently, I'm using a pair w separate forefoot and heel zoom air units. I think I prefer these to the full length unit bc it hurt my arch a little.