Cha kuen is another famous northern shaolin style. I haven't seen too many sifus in the States teaching it. Jason Tsou, Paul Eng, Wong Jack Man and Master Zhang know sets from the cha kuen style. They are different from the hong or shaolin style. I've learned #6 and #7 from the Hong or shaolin style. I'd have to say that the Cha Kuen forms that I have learned are more advanced and smoother.