Joié I-anchor advance

[Frolicacid]

Does anyone have any experience of this seat? We need to get two 'spare' seats, one for my mum and one for dh. (Main seat will be in my car) this looks like a reasonably priced way of keeping ds (7mth, long & thin) rear facing.
We will go to halfords next week to have a proper look, but as it's quite out of the way for us , I thought I'd try to find out all I can before making the trek.
TIA