Depends how old they are. If they are more than a year old, you just have pretty pigeons.
There are different qualities of rollers. The best I've seen were Harder rollers that Dick Davis of South Whitley kept the strain going. Both men are now dead. Last pure strain might be his g'son. I got rid of them after Dick died as the fun left.
Before I'd ever buy rollers, I'd have to see the breeder's kits in the air. There is nothing more breath taking than seeing a kit of 20 birds all spinning at the same time at a depth of 50' and then collect back up and do it all over again. NOTHING more depressing than a huge story and when you get them home, duds.........