The longest we have ever stored anti matter is a sixth of a second which is not long enough to experiment with it. But that has changed with a pulsed laser that "cools down anti matter." It was conceived by a Canadian guy :^) If there are any differences as to how anti matter reacts to gravity or other things we can settle some truths. Physics loves to see the unexpected. When you get scanned with slowly released anti matter - positrons we can measure the light of the photons produced to take an internal picture of you. Perhaps you thought you had nothing to do with anti matter in your life, but it ain't so.
We can make anti hydrogen with an anti proton and a positron and even store it for an extended time compared to magnetic traps. Its as strange as a ghost busters ghost trap and has only been around very recently.
You won't be able to buy a gram of anti matter on Amazon for decades.