3 of 4 people found the following review helpful
Isofix and three point seatbelt fix,
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This review is from: Britax KIDFIX ISOFIT High Backed Booster Group 2/3 (Black Thunder) (Baby Product)
Definetly better on with the Isofix.
Can also been reclined few inches when connected in isofix but not when using only the three point seat-belt fix