I got this cage a couple of weeks ago, the bars are quite flexible indeed. However for my syrian it's got the thumbs up so far, it's a few centimeters smaller than the hamster heaven but I can't tell when they are next to each other.
I like it because it's a pretty good price if you get it from equine canine feline and use the 10% off code, and because it comes with tube stopper things, so that you can add tubes/extra cage etc if you want to. And because the opening is the entire roof, access is really good, especially if you're taming a hamster I would imagine.
The only bad thing I can tell so far is that when putting it together I found it a bit difficult with the corner pieces, and ehm... ended up breaking two of them because I decided to use a hammer
Oh and the fact you can't really hang things from the roof.