Habitat flip clock with the date / time / location. are they any good?

[megletthesecond]

I've always wanted one of these and seen that they now do a smaller version that I could fit on my wall and have as an Xmas present.

Do they work ok or do the flaps get stuck every so often? I'm not too fussed about having to adjust it sometimes if it loses / gains a bit of time, I just want to know it's not crap.

I was trying to find a secondhand one on eBay but most of the listed ones seem to have some kind of fault!

I'm not sure whether that's an indication of quality or not. Sorry I couldn't be of more help.