Mine I'm either getting really good or really lucky. I put my large target bag out and sighted the Chill in with my 20 yd pin. I then proceeded to do walk back to verify my rest position. I shot at 20, 25, 30, 35 and 40 yards. The first time, even though all the shots felt good, I thought it was a fluke so I did it again. Both times, if you took the minor left right variation out and used the mean line, the result was a perfectly plumb verticle line.
Next step is group tuning then BH tuning.