The size is ok. The Con's are:
1 The doors need ziptied and the main door will need secured with something you can take on and off, but the gliders can't get off.
2. The doors slide up and down ,we call them guillotine doors because they fall closed and can injure toes and tails.
3. The door is a pain to get a glider safe wheel in or out.
4. The wire used for flight cages are thin, flimsy, bend easy, break easy and the cage itself is loud when you put 2 or 3 gliders in there jumping around.
5. It will rust sooner than a heavier cage will
It's an OK cage, I've had a couple of them but I prefer the Brisbane cage. For about the same money it's a much heavier cage that will last longer than flight cages. They don't rust nearly as fast even with regular deep cleaning. The cage itself is quieter, and can handle long term heavy wheels on the side walls
Personally I like the vertical bars better than horizontal the gliders get around just fine either way. I have 3 brisbane's with 4,2,3 gliders in each one. There is plenty of room for the gliders, wheel, toys, etc.. and no I don't have all 3 cages out every single day.
I wasn't that impressed with the All living things cage despite it being bigger it's not as heavy as the brisbane's, it rusts sooner, the only benefit in my opinion is the large doors (which is really only a benefit if your gliders are bonded and aren't at the door leaping out every time you open it.) For me personally, I don't have the space or height to have 3 of these cages so it isn't a practical choice for me either even if I liked it better.
I'm not disagreeing with Byk just for the sake of disagreeing. Cage preferences much like anything else with gliders and accessories comes down to personal preferences as well as budget, space, and personal experience.
So, evaluate everything, size, space, budget, how long before you will need to replace it etc... because a pro to one person could be a CON to you or vice versa as it is for me and Byk.
I once had 2 brisbanes put together for 3 gliders, they were no more happier in it than they are in a single The reduced space seriously made no difference to them. It was a concern for me at first but their behavior didn't change in the slightest. But again, this is my experience with my gliders.
The perches can be left in, but they will absorb urine and will begin to stink. Some folks use them and wash them when they are smelly, and some won't use them at all.