I haven't had any experience with the Tekan but my experience w/ two blades tells me to stay away from them. They just don't open up a big enough hole for me personally. I used a package of2 blade expandables several years ago and did not like the bloodtrails they produced at all. I shot one doe that year right thru the lungs and watched her pile up about 70yds away. When I went to look to see what the bloodtrail looked like it was almost nonexistent. GET A GOOD 3 BLADE! JMO