Too Small
My roborovski hamster hated this cage, he was constantly bar chewing and climbing the bars due to how stressed he was. I tried it with my Syrian and dwarf hamster too, and I got the same results.
It is not tall, so I can't add naturally toys like branches in, and the base doesn't allow for the minimum 6" burrowing room they require, even when filled to the very top. The tubes are useless, as is the wheel (much too small and stiff) and the toilet is too small