Don't know anything about them I'm afraid, but a quick peruse of their website and the heavy emphasis on "we don't use treats" puts me off.
What behaviors are you looking to address?
That put me off a little bit too, as thus far my training with Daisy has been treat based. I did like that their guarantee includes no extra cost for each subsequent visit, though, as I'd struggle to afford it otherwise.
There's a bit of a list, really. There's her aggression and viciousness at the vets, although the vet is working with me on that and we've got a plan with the receptionists to bring her in regularly for a fuss and treat and positive experience to try and help her past that.
She's a nervous dog, and her fear tends to make her aggressive. She barks a
lot; in the car at people passing by, at bicycles, at other cars, at skateboards, push chairs, luggage cases, etc. She barks at people walking outside the house and she barks at visitors and it's very difficult to get her to stop. She gets overexcited very easily, which leads to yapping, jumping up, and biting - she's put holes in our clothes before from jumping up and biting. If she sees a lead, or collar, or anything she wants - like a cleaning sponge, or a mop or broom - she will jump and bite and bark. She also nips at other times, but it's worse when she's excited and jumps and bites.
(To clarify - she has never bitten anyone outside of me and my parents; with visitors, she's either in the kitchen, or now I have a crate, I pop her in there.)
She's okay with other dogs, but with our older dog, she is trying to be dominant, and she does food guard and growls when Poppy tries to go near. She also pulls on the lead. She's not keen on children and will bark, although she won't go near them (not that I'd let her get close to them anyway, of course).
She's a very, very clever dog. She's fantastic at training on Sundays; her recall is incredible. She does go off lead with Poppy when we walk her on the field and she is absolutely fine. If we pass anyone, she doesn't bark, or even go near them; she'll just do her own thing, and as I said, her recall is great.
I'd be reluctant to call her vicious, but I'm really not an expert, and I'm probably too close to it. My dad says he thinks she does have a vicious steak, which is upsetting, but I'm really hoping that with a behaviourist and a lot of time, hard work and training, I can resolve these issues while she's still young. Really, the jumping up and biting and aggression when she's overexcited, the occasional nipping and the barking and territorialism is what concerns me most.