Joie Mytrax seat size?

Does anyone out there know how big the Joie Mytrax seat is please? Length and width if possible please.

I've searched and searched and can't seem to find it, which makes me think it's not a good size..I have an iCandy Peach 3 now which I would keep, except my daughter needs to be crowbarred into it, it's so small!

Also, if anyone out there has one, what do you think of it? I don't have a car so need something well made and practical, but at the same time can't spend a lot as my daughter is very active and may refuse to sit in it in a few months.. especially after the cost of the iCandy!

Thanks a lot