I also have this cage that came with my pair last summer.
I would definitely go with the 'Congo' or the 'HQ large sturdy'(same cage different vendors) if space and cost is not an issue.
Like was mentioned above bigger is better. I would not keep more than 2 gliders in this cage. I have 3 in it right now and I feel it's cramped.
They are in quarantine right now(and hopefully moving into the big cages in a few weeks if everyone gets along), Once you get toys, a wheel and fleece in there...there is not a ton of space for climbing and gliding.
I also zip tied the side feeding doors, the grate to the frame and also zip tied the cage to the stand as well.