Again like a few I have not had any issues other than the first season we went with them. I buy a fair amount of stuff between me and our two kids. Just about to pick up some reduced training tops from last season.
Quality wise the main issue seemed to be everything that was not embroidered eventually peeled off and that is washing in a 30 degrees was like I do with all the families sports stuff that has transfers.
My major gripe is the price of a football top nowadays it's utterly ridiculous at £70 you can literally pick up a decent Lacoste polo shirt for that. TBF that is a whole of football thing rather than castore.
Would I mind if we went with someone else absolutely not but would prefer to go with whoever makes the most money for the club above all else.