These stamps are really difficult to use. Even after marking alignments on the stamps, they can be hard to use probably due to their small nature. I'll give them credit for their readability but it's almost impossible to stamp evenly with them unless you take a LOT of time to ensure they are in a good position, which can be hard to see since they are so tiny. If you have the patience, go for it.
my 1st set of stamps. with practise this is a good investment for your dollar.
These stamp well, but are really tiny. I tended to stamp them too hard and deep.