I have this cage and Daisy loves it.
I did pimp it out for her but still even as a basic cage it was great and good enough.....I only did it because I had the extra cage and didn't want to sell it.
I recommend adding slats to the ladders too....My Daisy slid down the ladder one morning and I noticed how unsure she was of walking down them.
I used wooden sticks (not tooth picks but bigger...ones you'd use for a BBQ). Two for each little indent in the ladder. I found that helped a lot and she's much safer on the ladders now.
If you wanted you could add plastic around the bottom to make it deeper so you can have more subscrate or maybe wooden walls to increase the depth?
I'm planning on eventually building a base from wood to make it nice and deep for Daisy. Probably next month.
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Loving on Rosie, our little Goldhamster, since February 2014.
Daisy; sadly Daisy went to Rainbow Bridge just before her second birthday.