I tried "My Pillow" months ago...maybe a year or so...but I bought it online. I was sort of shocked at the price but it did have the money back guarantee so I bought it.
I liked it. And mine was lumpy, too. It was like little pieces of foam all piled up inside a pillow case. I decided to wash and dry it and see if it would mellow out. It didn't but it did well in the washer and dryer.
I used it for several months and somehow it ended up in the guest room when my sister visited and it sort of stayed there. It was a good pillow but I slept just as well on the one that ended up on my bed as I did on the new one.
I'm glad you're enjoying yours. Finding a comfortable pillow is so important and once you find "the one" you guard it with your life!