If you can, try croissants made with French or Irish butter (86-88% butterfat) vs American butter (80-82% butterfat). If they don't publish the butterfat content don't buy it or look it up online first.
Do not even think of making croissants with margarine. That is culinary heresy.
(Punishment for culinary heresy is being flayed alive. Then lightly breaded, fried to a delicate brown, and served with rémoulade.)
"Ceterum censeo 0bama esse delendam."
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)
I have had them in France.
Very nice.
Margarine has been forbidden in this home for decades.