Any thoughts on the hippychick hip seat or similar?

[Rainbowsend]

I'm thinking of getting a hip seat. My little man is 8 months and just loves being in his baby bjorn carrier on his dad. But I just can't carry him in it for very long. I find myself tilting my back back to support him as he leans forward. I am going to a fayre at the weekend and thought I was seek anyone's thoughts on the hip seat.

Thanks in advance.