It's still amazing to me that a car seat that costs as much as any Britax doesn't come with a cup holder. Even after reading a plethora of bad reviews, I still thought I'd try this out because there aren't any alternatives. Don't waste your money it isn't difficult I install, but it's extremely poorly designed. It just attaches by being shoved into a notch between two different parts of the plastic shell of the car seat. These two plastic parts don't overlap or connect, so you just kind of shove it in there and it sits with nothing there applying any counterforce against a weighted cup. With anything larger or heavier than a small (4-6 oz) lightweight plastic cup, the whole cup holder pulls itself out of the area it's "secured" too. Ours has been fought with for about a year now and it's damaged the plastic shell pieces and padding around the area the cup holder attaches. It is worthless. Britax, this has obviously been an issue for several years, I wish it would be addressed.
* This product review was collected by the manufacturer.