I have the 3 rung, and my wife and kids use it all the time. I have never needed it he ladder until I got my Greenjacket. The large clamshell on the front of the jacket hits the tube when I pull myself up and knocks me back down into the water. It's really bad when I've got their little throw rope tucked behind the clamshell. Thanks to the Greenjacket, I now use it quite a bit.
I do have it attached to the frame and not the handle like the inventor shows. The two rung might be ok if you attach it to the handle. After using it for 2 seasons I can say without hesitation to get the 3 rung. It's too hard to lift your leg onto the 2nd rung. Pulling the 3rd rung down makes it much easier to step onto it. I'd rather have too much than not enough.
Also, placing the ladder so that there is something to grab ahold of like a side rail or net after the top rung helps immensely to keep climbing out of the water. Finally, practice using it to get out in low stress, flat water before you try it in Lava. It took my kids several tries to get the knack. When climbing a rope ladder your feet want to go out in front of you. This prevents you from using your legs to lift yourself making it so you have to use your arms to do a pull up. If you can do pull ups, you wouldn't need the ladder anyway. So to climb it successfully, you have to use your core muscles to pull and maintain your feet underneath or even better behind you.
Sent from my iPhone using Mountain Buzz