Our cybex x-fix just arrived and it just looks strange to me. The isofix is all clicked in but the seat just seems a bit wobbley in comparison to the priorifix DS1 has been in until now especially at the top. Is this normal? I thought I was buying the safest booster seat but I'm worried now :( has anyone had any experience with this? Does anyone know what other seats scored highly in this year's which report?