Thoughts on the mamaroo

Ma
Wondering what everyone's thoughts are on the mamaroo who have actually purchased and used one?
At first I thought they seemed really cool but after looking at them at Babies r Us it's actually quite a bit bulkier than I thought. Likely won't get one for this reason alone and will likely go for one of the much cheaper and lighter vibrator/bouncy chair options that I can easily transport from room to room. 
They seem extremely popular despite the high price tag, wondering if I'm missing something here???