I used to also wonder how so many people where shooting their chrony's.
Then I got one this summer and sure enough, on the first time out with it at the range I managed to shoot both the front and back rods with one 10mm shot from my G20.
I was totally distracted by the readings so I cheated my eyes down to look as I was shooting. The really sad part is I bought the bluetooth transmitter to send all the info to my phone.
And I still was trying to look at the front of the display as I was shooting!
I think a few things factor into it after owning it for a while - one is that (at least at my range) It's difficult to line up both the chronograph shooting window and the target stand down range during a short cease-fire, so many times you don't have a definitive aiming point.
The second is I need to develop more patience with getting the results and seeing if the shot read or was an error.
I bought four replacement rods. Hopefully, i don't find a way to hit three rods at once the next time out!