We've got 2 of these (will have 3 once youngest outgrows his harnessed seat) and find them comfy and easy to use. They get great safety reviews and the reclining headrest is good if they fall asleep. The narrow width is also handy as I found a lot with the addition SIP cushions don't allow for 3 across but these do.
Bought one at Argos not long ago at the same price. Good ISOFIX car seat.
£79 at Uberkids with free sunshade included. All colours available at this price apparently. https://www.uberkids.com/uk/cybex-solution-x-fix-group-2-3-car-seat-1470317/?sku=CYB514116005&istCompanyId=37dca0b5-f08f-460a-9189-9153d7108287&istItemId=-xiaxxtaipi&istBid=t&awc=6412_1540031411_de9f9958176e90c90ad365acec55bf6e&utm_source=Affiliate_Window&utm_medium=Comparison+Engine&utm_campaign=73258/
We have one of these, bought for same price a few months ago. might buy another as it seems good and we prefer it to one of the other seats we have. Not too wide at its base and comfy I’m told!