I took my sheltie to Puppy Power (actually one of her students has her own classes at the same facility) and I wasn't overly impressed. We didn't learn alot in 6 wks.
A good friend suggested McCann's in Dundas for training classes. THey are more expensive, longer duration and worth every penny. My sheltie is very reactive and timid and we've actually done more classes at McCanns. I'm about 45 minute drive and have enjoyed the classes immensely
I also took her to a behaviourist because I felt I wasn't making any headway with her lunging and barking at other dogs and people when out walking. She was quite reasonable and I can highly recommend her also if you want.