The tummy time frog has been quite useful for my son, but more as a general cushion than always for tummy time. He's 3 months, & still gaining head control, & its not clear how to position him on the cushion to best help him support his head -there should definitely be some guidelines with the product as I sometimes worry that I'm putting him in a the wrong position as his arms don't quite reach far enough to fully support himself! Having said that though, he does like lying on the mat & playing with the crinkly bits, though a lot of the time I do without the cushion & just use the mat & the mirror.
He really likes the mirror, which is a good size & seems nice & durable, & he also likes the mat itself. Even if you don't use this for tummy time, the mat a a good size for fitting into a small floor space if you want to put your baby down somewhere to play & don't have lots of floor space!