Please help me . Is Aliexpress a safe website?

Is Aliexpress a safe website? i was really thinking that it was a safe site but after i search in the internet about the feedback , i'm not so sure now please i was about to do a request of 189 $ but i'm afraid that the seller is fake please help me
Update: well i also bought many things but i really like this dress and i already spoke with the seller .
http://www.aliexpress.com/item/Newest-Miley-Cyrus-empire-strapless-sequined-short-mini-evening-gown-red-carpet-celebrity-dresses/1095898789.html
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