Glad to see a review of the fantasy
Just thought I'd add my experience of this cage. I have never kept a hamster in this, but we have one with 1 extension as a mouse cage. It is fine for adult mice so i would have thought that it would be ok for larger dwarf hamsters. Young mice are another thing entirely and I wouldn't put our robos in it (as they
may be able to escape the bars and am not sure they could climb the tubes).
We find it really nice and easy to clean as it can be wiped over really easily and you can clean it in stages as it all comes apart. It has pretty good access and the levels are a nice size. It is expandable so can become a very big cage. It can be subdivided so you can have essentially stacked cages if you have limited floor space. And you can just use the main cage without any extensions as a good holiday home.
Only thing I don't like is that the tubes are a bit awkward to put together and the cage clips are quite soft plastic so not sure how long they will last. And I guess it is quite pricey at first (£45 for cage and 1 extension) but do personally think it's worth the money).