Due to its price - power reserve. You must wear it often or may have to adjust every time you have to use it.
Due to its price - locking mechanism of its bracelet
Minor - When I received the watch, there was something (embellishment) missing on the bezel
Overall, I am satisfied with the purchase as it doesn't cost that much to have an automatic watch. No longer have to risk my other watches =P Regardless of the missing part on the bezel, it is functioning based on intended purpose. Watch looks more than the price you had paid unless, the person looking is a watch enthusiast or, at least, familiar with the submariner.
I was expecting a glossy and hard board paper bag. I was also expecting the item to be in a box with a pillow (Since I am going to give it as a gift for father's day.). Anyway, I hope that the watch will last long.