I quickly skimmed the site, I wouldn't say they are die hard Koehler, They say they train one part correct and 2 parts praise. I don't think Koehler had any praise at all.
I took a class with Masi like this, no treats, nothing but praise and correction (not hard correcting, but correcting)...She LOVED it, she was not into purely positive (whole nuther story which actually was a negative experience) but really thrived on praise/slight corrections only. Masi is not a treat motivated dog, she lives for praise and loves to work, isn't a soft dog where a correction will shut her down, she recovers quickly and moves on. I think I have a pretty solid dog that can go anywhere (safe anywhere) off leash and be called off whatever it is I need to call her off of.
Keep in mind, if I took the above with my marshmellow aussie, she would have withered up and died..She was trained with positive methods.
So it depends on the dog, and I can't honestly say 'how' this training place does train without having observed it..
My suggestion is go watch, especially a beginners class that has just started, where dogs are usually unruly and see how it goes. If it's something you think you and your dog would benefit from, go for it. If it's not for you, well atleast you went and observed.
Danger Danger vom Kleinen Hain aka Masi
"Angel" Jakoda's Bewitchen Sami CD OA OAJ OAC NGC OJC RS-O GS-N JS-O TT HIC CGC
"Angel" Steinwald's Four x Four CGC HIC TT
Harmonyhill's Hy Jynx NA NAJ NAC NJC RS-N JS-N HIC
Jakoda's Jagged Edge