I agree that it depends on what you want to do it for. I believe they came out of John Fisher's courses, one of which I did some years ago now which was my first, and called "The Canine/Human Interface". It was very good for what it was, but it doesn't make a person a behaviourist

I do rate Sarah Whitehead and also COAPE, which she used to be with. They also do some courses and if you want to do behaviour work then you might be better off going for them and doing the advanced course. There is also the Compass diploma, again rated well by those who do it, and this might get you into the UKRCB. These are really for if you cannot do a science degree in animal behaviour.
If you can do a degree, that is the best option for getting into somewhere like the APBC which requires hands on and theory. I did Bishop Burton foundation in canine behaviour and training, and am now doing a degree in Applied Animal Behaviour which is a part time top up.
However, if you simply want a dog course for your own information, I'd say Think Dog, or COAPE would be good, however that's JMO and I recommend asking further