Before I bought my shield, I tried my nephew's shield out at 7 yards. I used an IPSC target and loaded my 4.25 FS and the shield, and ripped off sbout three fast shots from one, than the other, then back and forth until empty. It convinced me that I wanted a shield. I did notice that the gun shot left for me.
After I bought my shield and I was spending my obligatory time in front of the tv, dry firing and shooting bad guys, I noticed that when I gripped the gun in a shooting grip, that the front of the barrel pointed a little to the left.
I got a roll of masking tape and made a pad to go between my palm and the gun. The sights then aligned perfectly for me. I ordered a set of Talon grips and built a pad under the grip area with extra grip material I ordered. I put the Talon grips on and the pad is there if you know to look for it. Otherwise, you can't see it.
Now when I throw the gun up, the sights align perfectly. So if you are shooting left, check your natural sight alignment and if it is pointing a little left, you might want to try the pad. I have big hands and I have to pin the grip safety's on my 1911s for them to always go bang.