This piece is necessary to use the Pipa Nuna car seat in the Silver Cross jet stroller, and does its job. However, the directions seem to be written by someone trying to emulate IKEA instructions but doing so completely totally incompetently - I am very handy and while following the directions was unable to install the piece and then, once I figured it out without the directions, was unable to detach the car seat once it was installed. I threw away the instruction sheet and figured it out on my own but SERIOUSLY the manufacturer should improve bigtime (and/or offer online videos and/or use WORDS?).
I subtracted one star from this review because although Strolleria's website says "most items ship via Fedex" (why I chose them instead of another vendor) they actually shipped it via USPS which at the time of this writing is a hot mess (and which they should know - why make customers angry when you don't have to?) so I got it rather delayed, which was annoying.
The new 2020 model adds a cross brace that makes this adapter significantly better than the old model.