The double offer for me appeared after I redeemed for AA (shortly before AA left the program). I have ordered 2 Target gift cards this year if I remember correctly. The first one came within a week. The 2nd one which I ordered about 6 weeks ago has yet to arrive. So I may never see anything of value from that redemption.
I have no idea what I would use $350 worth of credits on and I sure can't figure out how anyone is even receiving that amount of offers to begin with. I am lucky to get 2 surveys a week and qualify for one. And I have options set for as many as you can.