Directional porting is advertising lingo. ALL porting is directional, designed to direct the fuel mixture into the cylinder so that the cylinder gets filled and not too much escapes out the exhaust. Only time will tell if the MVVS porting is any better than the rest.

When I checked your weblink I saw that they are trying to differentiate thier porting design from the "open port" design shown for one of their competitors. Not sure who uses that "open port" design, but it's not a 3W. It's interesting that MVVS is using an aluminum connecting rod - others use a hardened steel rod so that caged needle bearings can ride directly on the rod surface. MVVS must use a bearing with an outer shell of steel. Also, I notice what appears to be a nylon stuffer plate bolted to the crankshaft web - to reduce crankcase volume and to help pump mixture into the cylinder.