It holds good enough, but if you shake it, no it will open, but no issues just carrying it around or sideways. It seems to get better the more it's used.
Thanks for your info. I just found at I will go for an iSmart version of Yoobao case as it looks a bit more functional to me with folding smart cover. but I think the magnets will be similar in both versions of the cases.
http://www.yoobao.com/en/product.asp?b_id=146&m_id=200&a_id=575