I love the repositionable adhesive. It is amazing that you can lift it up without leaving a residue on your paper and move it to another spot or adjustment. If you scrapbook like I do, you don't always want it stuck permanently immediately. I sometimes don't get it in just the right spot or straight the first time. It also does not gum up or "skip" when applying it the back of the paper/photos like other adhesives have that I have used.
I bought repositional dotto when I started scrapbooking and have used and loved it every since. Repositional--because I tend to experiment and change my mind; dotto--because it's so easy.