I train in CSW under Mateo De Los Reyes on the east coast. Mateo is one of the lead associate instructors under Erik Paulson. CSW is basically a blending of BJJ, Judo, Shooto, Sambo, Catch, and wrestling. I think its great and we have plenty of guys where i train that compete in Grappling tournaments. The only downside is if you have poor self control. CSW is an adults only class so leglocks, including heel hooks, are taught very early on. Paulson is known as a leglock specialist so their is an emphasis on becoming proficient with them. Every third class we allow striking while were on the ground to make you more comfortable groundfighting in a real or MMA situation. It sort of follows the JKD philosophy by taking the most effective subs and other moves from each of the above styles and incorporating it into one huge arsenal. I took BJJ for a bit an i love CSW in comparison. Its more aggressive and submission i your number one priority.