Another Ikea Antilop Fan here.
I picked up an Antilop on Freecycle a couple of months ago and dearly wish that I had one from much earlier - the cleanability of the thing is fantastic!
We initially bought Polly Chicco. Don't get me wrong, there is alot to like with a more expensive chair the tilt is a good thing in the early days as is the extra cushioning and the foldability of the chair. Also the 2 layers of tray have been handy. And I also like the 5 point harness.
Getting the food out of the crevices in the chair cushioning and the straps in the Polly drove me insane!!!! I did not realise it until I did not have to do it anymore!
Good luck.