I have collie x's and Iv had more problems with mine than my mates have had with bull x's. Egnore 99% of the shit on here if bull x's were all nasty, hard mouthed, slow, bad feet etc why the hell is there so many lads using them and iv seen 4 maybe 5 bull x's run and every one had pros and cons but id have been more than happy with any of them. There all slightly differant you just have to take them as they come.