Let me start by saying that buying multiple parts for an already expensive stroller is very frustrating. I understand people want to personalize their stroller, but personally I think a cup holder and tray should be standard on ALL strollers. It was a bit difficult for me to assemble this particular product as the instructions were just pictures (like Ikea instructions). But after a few minutes I noticed. That's why I gave it a 4-star user-friendliness rating. The strength is good when properly assembled, but if you leave it attached when put away, you need to adjust it before use. The only thing I like is the storage compartment. Enough space for mobile phone, wallet and snacks.