I'm trying to love these. It's so hard to stamp a straight line, and I wanted this thick tape to help.
The adhesive is great! You can pin your blank down so it doesn't wiggle around, and I've been able to use them more than once. But my lines are still off. The tape is already a little thick but perhaps stacking two on top of each other will help me "feel" where to place the stamp.
The problem with all stamp-straight tapes is that lower case letters like "j" and "p" drop below the line you're trying to maintain, and part of the letter ends up stamping through the tape, making the bottom a little less crisp. This is true of all tapes, so I don't fault this one in particular.
What I love BEST is the circle templates! I leave one on my steel block to re-use whenever I am working around a circular blank. Really, really helpful!