Parents don't vibrate like bouncy seats or swing like swings. They bounce and sway, and that's what the mamaRoo does: it moves like you do. The 4Moms ...
"Not a swing or a bouncer"
Reviewed by giannarose22 on Oct 3, 2013
I would recommend the Mamaroo as an additional seat but it really can't replace the functions of a bouncy seat or a regular swing.