Wow, is that actually the difference between having polished edges and not? When I asked them what they meant by polished edges they said it was mostly an aesthetic thing; I had no idea that the edges would be sharp with polishing.
Perhaps it is a terminology misunderstanding. Hard to see how ANY commercial tank builder would sell a rimless tank without easing the sharp edges …. seems like it'd be a perfect negligence case. They may mean beveling the edges for aesthetics.