This cute little self-inking rolling stamp is a great idea. You can roll it in straight lines or curvy ones. A cute little retracting cover keeps the ink from transferring when not on duty. Perfect for borders as well as draw-the-eye embellishments (like arrows only a line of dots). I just used mine for some cards and am happy. I know I'll be using it on artist journal pages.
Now for the but... The ink is not permanent or water proof. It's a nice dark black which is good, you're just limited with what you can use it on top of as well as underneath. This is not a problem if you plan ahead (which I rarely do). A more serious matter is the construction. This stamp is not sturdy. The roller slops a tiny in the housing. The plastic shell is not very high grade. Because of this you will need to treat it with more care then the rest of your rubber stamps.