The bottom line is, is it some thing that you just can't get over?
If so then go back and have it redone.
If you can get past it then forget it and move on. That decision is up to you.
For me, if its in a spot that I do not concentrate on, like a window I might not look out of all the time, then I would probably let it go. If its the drivers window and staring me in the face all the time, then I would go back. Again, it's your call.
Some tiny imperfections do even out a bit, but not 100%.