There are 3 reviews with an average rating of
4.66
best price,very fast service. thank you very much
These seemed to be out of stock everywhere when I needed them but Samuel Johnston has stock.
They are very handy - just insert into your car seat and forget about them, and when you need to attach to the Oyster pushchair they are right there. They don't need to be removed when not in use.
One slight issue with leaving them in is that they become the lowest point so when the car seat is on a level surface it stands on these adapters. Not a big problem but it means if you nudge the seat it may rock from front to back slightly and wake your baby.