I give 3 stars for the following reasons ..
1. If you don't get the baby set it doesn't attach (and luckily I ordered it) nowhere is it mentioned that only this way can it attach to be used on the chair. So its use is limited for years until the baby no longer fits in the baby set. Ours is a developed baby and I will come back to say until when we will be able to have the tray too..
2. As the others mentioned in the comments, it doesn't stick to the surface, bowl, toy, etc.. So you have to buy extra via the internet and mainly from foreign sites the surface you put on top like a placemat so it can be removed easily for cleaning or so that the little plates stick, so that later the baby won't throw them on the floor. Stokke does not provide these.

** I leave the price uncommented for the chair's accessories, because when you knowingly go to this company you know in advance that it will necessarily cost as much as buying 10 little chairs ..

Little expensive and nothing will stay on this because of the structure. So all the plates with the bottom that would stick on it, won’t!

Very good quality, fastens easily, is safe and all the other good things. But the price is disproportionate to the item.

It fits very well on the high chair, a little difficult to clean underneath although it hasn't been necessary so far. It is indeed comfortable on top, it didn't bother us though.

Like all the peripherals of the Tripp Trapp, it is very expensive. But okay, you know that when you buy Stokke products.

It is a good disc and quite sturdy, but it is not worth its money. If you are thinking of using a suction cup plate, forget it. The disc is slippery and does not stick to any plate. Also, if the bottom part gets dirty (e.g. from dirty hands), it is very difficult to clean as it consists of many small frames. It is better to put the chair on the table and not have a disc. It's a shame because the chair is amazing.

Very good. Cleans easily. Easy to install, difficult to remove and this is a problem because in order to clean it from food you either have to go back and forth with the sponge to the point where the chair is, or move the chair next to the sink. Finally, excessive price.

The disc is fine, fits correctly on the highchair and accommodates the baby well, but I think that if there is a table for the baby to eat, the disc is unnecessary.