I have the Outdoorsman stud on my EL 12x50s.
If I had to do over again I would go with Kramer Designs stud and rapid release tower.
I spent some time at the KDC booth at the sheep show and played with his set up. In my opinion the Kramer set up is easier to use than the Outdorrsman, it's top loading. The Kramer is probably a couple grams lighter if that is important to you. I own products from both companies and will buy more from both in the future.
note: the bino studs for Kramer and Outdoorsmans are not "drilled", they are "pressed" in. If you already own your EL12x50s, you will need to send them to Kramer or Outdoorsmans for the stud install. If you haven't purchased your binos yet, you might want to consider the Outdoorsmans. They will include a free stud and installation with the purchase.