Since we have been talking about blade types over in the non-martial arts, I got inspired. This video shows three different dual wield moves performed with three different types of blades. The first move is a dual obi/ani, the second is rotating flowers, and the third is a dual inverse obi/ani. The blades are respectively heavy grade 24" initiate blades, mid-grade 36" standard blades, and heavy grade 36" standard blades. My dual inverse with the initiate blades is a bit flawed as I did it last and the heavy grade full length blades took a toll on my wrist. The result is that the MG blades are just a bit slower than the short blades but do take more effort. The HG full blades are ridiculous and best left to one weapon spinning. Basically look into getting a blade well suited to the speed you want to attain. Hope this helps.