My son hated the Merlin with every fiber of his being. We used the Luv to Dream for awhile (the arms up meant it was hard for him to roll in it), then switch to a zip-a-dee. I loved the zip-a-dee but I'm cheap, so my mom and I figured out how to make a bigger one myself when he outgrew the small. If you sew at all, it was actually pretty easy!