I have the same review for all of these stamper heads. They are great but can be inconsistent so it takes practice and you should test on a scrap before using on your project to be safe.
i bought 4 of these stampers. Of the 4, only 1 provided dark, consistent stamping. The rest left relatively faint marks and ran out of ink quickly. I had hoped to use one of these designs on my Christmas cards. Now I'm not certain I can depend on my choice to give me the results I want. Proceed with caution.