I usually put installing and moving in the 'too hard basket' but I found this super simple to install with IsoFix. It fits beautifully rear facing in my Mazda 3 hatch. Previously we were using the Britax Unity Capsule but my husband could not fit in the front passenger seat when it was installed but the slimline saves us oodles of leg space. Headrest easily slides up and down for height and the straps are super easy to adjust on the fly. I found the slimmer size not compromising on quality or safety features. It feels very sturdy and secure.