I was looking on Ebay at this product. Haven't heard much about it.... does anyone here use one? Do you like it? Is it worth buying?

DD sleeps in her cot as she outgrew her hammock at 11 weeks! She didn't like it anymore. Anyway, she moves around ALOT and she is in a sleeping bag some times and other times she's wrapped. I do worry she'll be able to roll onto her tummy and get stuck as she is very strong and already has rolled over once. (during play time)

Just wanted to hear about it before I considered buying one. Is it a waste of money? Is it comfortable for babies?

TIA