I had a tang stamp made recently. It's the same logo I use on the site but significantly smaller - so small in fact that I've actually been having a lot of difficulty testing it out on scrap bits of steel.
I'm not sure if it's actually the size that's the issue, but more the shape.. or maybe I just need to practice a whole lot more before I can get it to look right. It seems to pull to the left or the right whenever I hammer it so I end up with half a logo embedded in the steel.
On the other hand, as a song goes it "looks good in leather" so I've got no complaints if I want to stamp sheaths. I'm considering building a press with a hydraulic jack so I can align it properly and not have to hold it with one hand while using the other to attack it with a hammer.
Another consideration is that I go back to my design and put a little more work into it. We'll see though.