I've used the old version Tekan II's in the past and they will be in my quiver again this year along with Rage's. The Tekan's are similar to Rage's in the way that they open. They both are rearward opening heads which makes the KE loss very minimal. Reaerward opening mechanicals are the way to go if you are a mechanical broadhead guy in my opinion. From my experiences, the Tekan II is a lot tougher than the Rage but BOTH will get the job done adequately. The Rage will leave a larger hole.

However, I haven't had the opportunity to play with the new Tekan's. They didn't change much though.