I use SID on many of my quilts (because I have not figured out the FMQ process to a point past sucking). Now I may sound a little touchy, but none of my quits look like they came from WalMart.
BTW, I start in the center row - but not in the center of the quilt. I start at the top of the center row and work the rows of one side. Then I flip the quilt and starting in the middle, work the other direction. Rotate 90 degrees and repeat. As long as the sandwich was taut - NO puckers.
I'm pretty excited because I just signed up for a series of classes on machine quilting.
SID works best with a walking foot and for me, the stitch length needs to be increased a bit.