I've owned two, years back and they were ok, tbh one was very good. Though niether came directly off him but both were from his kennels.
Would i go to Hancock for a collie bred pup...? Well a few years back i may have said yes, only to get 'exactly' what you want. Now i would say no, deffinatley not. There are so many more collie blooded dogs out there now, from worked parents and far cheaper. I'd also agree with Tomo, Darcy and Omayana and would question why only collie in the mix?