I quilt on a long arm and will SID some parts of almost every quilt (I rarely do pantos) even with edge 2 edge I will usually SID borders, etc. to stabilize it. Each quilt seems to dictate whether SID is called for--sometime I will because I know I'll be rolling it back and forth to change thread colors, or because it needs stablizing around the blocks so I can FMQ the actual block. One place I rarely will SID is with 8 point stars or similar, since many people will press open the seams on stars that have multiple points and I don't want to jeopardize those seams. I prefer to use SID to stabilize a quilt than doing basting on one. SID definitely will emphasize that seam nicely--Judy Madsen (Green Fairy Quilts) suggests you SID every single piece!