There is a guy who calls himself Bladed Thoth who makes it his business
to review each Giveaway_of_the_Day during the download period.

His reviews can be found at http://www.bladedthoth.com/reviews/

His reviews seem honest and properly and well done to me.
I usually read them first whenever I am interested in the giveway.

The GiveAway's change at GMT+7 hours each day.