Last year I made the decision to trust my life on the street to Second Chance body armor. I got the level IIa because it stops the most rounds. plus I got the Trauma Plate for the front.
What scares me is that, although I can fit an extra trauma plate in the front, I cannot fit a second one in back. As of late I have taken to duct-taping a second trauma plate to the area of my back where the heart and vital organs are located. Then I put my vest on.
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BTW, I am, of course, usually carrying a pair of ceramic plates in my briefcase so that I can shield my head. My SO (we work as a team when necessary) has a similar accessory containing a breakdown NEF single-shot 300 WinMag with an 18" bbl. The plan is that I shield us with my body and “catch the rounds” while she assembles the NEF. I lay down covering fire with my 23 (Bar-Sto .357 Sig barrel) and she makes the long shots. I will then throw smoke grenades to obscure the area while continuing to lay covering fire. The problem, of course, is when I have to turn my back to run, and then the problem crops up.