[cypher]

I've kept Chinese & Russians in the hamster heaven & it's fine for adults, most of mine have been about 10 weeks when I got them & the bar spacing was no problem but I think it may have been to big for my youngest at 5 weeks, I doubt she would have got out but she might have got stuck trying!
If you do use it I think it's always best used without the tubes, penthouse & other accessories, with the base filled with substrate you can use a house as a shelf or make small free standing shelves to maximise the space & have room for a large enough wheel, hideouts, sand bath etc.