I am pretty fussy with a low tolerance, but it does depend on when I find the problem and how long it would take to finish it. My last finish had a huge tuck on the back - my first ever. I finally decided to hand stitch it down - thank goodness it was a swirly print. The Labyrinth on the machine now as a least one spot where a high contrast seam didn't line up. My mind says I am done piecing and to just quilt it. My son won't care.