Saw an ad in Turf mag. so, I got some literature and a video. Impressive, so I bought one ($ 180). However, since I already run double blades, the improvement in mulchng was negligable. It also left a windrow along the right side of the deck soon as the grass was long enough to really need mulching. The only nice feature was that it directed the clippings to the rear, so I could go around beds in either direction. Anyway, it now is hung up in my shop. Made in Fl. and seems to be sold mostly in the South. Maybe the southern grasses mulch better. Or, maybe it works when using single blades. Any other users? Any advantage?