I have two gliders and use the Cobra one man rigger for both. I have tried at least two other designs and watch other pilots using other systems.
I have a mature back and knees. I rig my planes by myself all the time.
The Cobra has a wide wheelbase and large wheels that make it very stable.
The height adjustment is with a crank that takes very little effort.
There is a lateral adjustment feature that makes the slight fore and aft movements of the wing needed to align pins very easy. It all breaks down into sizes that fit very easily into the front compartment of the Cobra trailer, or better yet, into the under-trailer drawer.
Wind is your enemy when solo rigging or de-rigging.
A second person whos sole job is to provide lateral bracing against the wind should be used when there is significant wind.
I have never had a wing get blown over using this system.
I have lost two wings to the wind with other systems.