I like it for pressing long seams to the side (or open) and also for pressing short seams open (not needed for pressing short seams to the side). Makes it easier. Also, for the long seams, it prevents me from pressing in a curve; the resulting pressed seam is straight. You can make your own if you can find half-round dowels. I just bit the bullet and bought a set of Strip Sticks:
http://www.thestripstick.com/