I bought my first Rolers 2 months ago (ish) , the bloke I got them off let me watch them fly and let me chose wich birds I wanted , this way i know they role , he told me the first pigeons he bought 20 years ago did not role because the bloke had sold him rubbish, so my advice will be see I'm flying before you buy ,
I have not let my birds out yet waiting till I get some young off them can't wait till spring ,