I purchased the converter seat to make my single icandy a double. It attached very easily one you have attached the double brackets. It can parent face or world face. I preferred to have it world facing as it meant that my youngest child was closest to me and i could see them better.
The recline is great and it goes totally flat (although the seat is only recommended from 6months) it fits nicely and does not affect how you push or get in the way. It also looks really nice. It is a little expensive but for me was well worth the money to ensure my children were comfortable. The converter seat offers as much comfort as the upper seat which is brilliant as often on a tandem pram the lower seat is not as nice
We absolutely love the icandy lower seat. Perfect for my baby to be under her big sister on her peach pram. And love the fact that we didn’t have to buy a whole new pram when we had another baby, just bought the adapters and lower seat and we were away. She loves it down there too, kicking away on her big sisters seat lol. Great that it reclines almost flat, and with the right adapters can be parent or world facing. Still room to put stuff in the basket underneath although it’s harder to get to with both seats on. But worth it. We also love all the different colours to chose from.
It is very roomy for a tandem seat, and seems very comfortable. The seat is quite expensive, but is very good quality and will last years. The buckle is very sturdy and won't be easy for toddlers to open. The shoulder and buckle pads are padded well, so they will be comfortable for baby.