Love It.
It works great.  My favorite jeans fit perfectly everywhere but the waistband, and I just need another 1/2 to 1 inch there to feel comfortable.  This worked exactly as I had hoped, so I bought a second one so I could do two pairs of jeans at a time.  The most important thing about this particular device is the clamp on one end.  It holds your button area so that the buttonhole and button don't get stretched.  I would avoid competitors that don't have this feature.
Rating: 5 stars