As the title suggests, I own other Tenga products and they are 10x better than the GEO series. I own the Tenga FLEX White and Black, Spinners 2 and 6, and the 3D Pile and 3D Spiral.The GEO series is bad because these provide absolutely no type of suction and the worst part is that this does not envelop the entire penis so pleasure only hits depending on where you stroke this with. Compared to other Tenga products, they do it all. The GEO series. not so much, stay clear of these.