
Ive got 2 flatcoats - both of whom have done agility at some point or other - There are an active dog which want to work - but they often dont have the speed of the collies - although I think there is now a flatcoat who has won her Agility Warrant
In my opinion I dont think there is too much difference in the lines - although both my dogs have the same sire, and would probably both be classes has having showlines - although the people who we got the bitch from also used to work their dogs. One will work but doesnt necassarily have the enthusiasm to do it - where as the other has too much enthusiasm and has yet to get round a course without being eliminated due to his madness and if other things were different would make a fantastic dog for agility competitions
Compared to a collie - they would probably take longer to train and you would need more patientce to cope with the clowning around and they are less likley to be as fast - but other than that they are a fab dog!