You will lose one tuner if you change to a Super Joey from a 2 Hopper configuration. That means that, today, you have 6 tuners and with the SJ you get a total of 5. You can only have a SJ on a single Hopper, 2 Hoppers are not allowed. Also, you can only have 1 SJ. The good part of the SJ and Hopper is that you can access all 5 tuners, and record from them, from any receiver location. If I were you, I'd keep the second Hopper. Now, if you want to lose a Joey, simply call and have that location disconnected. If you own the Joey that's all you need to do. If you are leasing it, Dish will send you a box to return it to them.