You can use any tent you like or if you already have one as long as the zippers are secure so no one can escape.
The Genji is recommended because it is mostly mesh and it's easy for gliders to climb(the nylon parts are hard if not impoosible). and it pops up and is open in 3 seconds and you can fold it up in less the 20 seconds. It is definitely worth the money in easy set time alone especially if it's used mutiple times a week(some use their daily).
I had 2 other tents before I purchased the Genji and the poles were such a hassle to set up and tear down I wanted something easier.