The jury is still out, for me. It was highly recommended by several mumsnetter & a few friends, so I tried unsuccessfully to find one second hand, then gave in and bought one new. I started using it when dd was 12 months last September, but she squirmed and didn't see the point of it. Now, at 19 months (same age as yr dd), she sits on it quite nicely. That said, I haven't figured out if there is any huge benefit to taking her out in the hippychick rather than the pushchair. I'd heard the hippychick is great for popping round to the shops if you happen to live a few steps away. But what if you actually buy anything? Then you have to carry dd and your shopping. Of course you can also put dd on reins, I suppose, and she can alternate between walking and sitting.
So you can probably tell that I like it well enough but am not sure it's really a necessity. . .
I think you'd get use out of it on a haoliday to France, but I think you also might be like me and wonder if it's actually better than the pushchair in the end.