I don't have any buyer's remorse over any breeds, but I ordered a "white layer assortment" and was sent a Polish. Don't get me wrong, my Polish girl Poppy is everyone's favorite chicken. She is curious, sweet, lets you hold her. She is all-around a well-loved chicken. However I have my laying chickens for practical reasons first and pets second. This little gal lays an egg like twice a week and the last one I weighed was a meager 36 grams! I'll never request a white layer assortment again!
I've had cochins too, and as sweet and silly as they were, they were poor layers and not heat tolerant, so I'll never seek them out either. I still enjoyed them in my flock!