@Kipawa:
The trainers are www.dogsmart.ca, and the trainer we are getting is the owner of the business, who is extremely well thought of in the dog community here.
From what I can see on their site, they are clicker trainers. I would expect good results, but since they use a high rate of reinforcement, your dog might gain a bit of weight!
Seriously, the nice thing about having an alternative, such as a harness, is that you still need to exercise your dog while you are working on the loose leash training, and using a different piece of equipment is likely a good way to separate that from walking with a collar…..you aren't being inconsistent and messing up your training.
I like the idea of having something I can use for our occasional walks on the road that isn't going to choke my dog, and gives me an alternative to time consuming training for something we won't be practicing all that often. (yeah, colour me lazy!)