I purchased the 1"/Large tag for my Great Dane who wears a size L collar. I took the advice of another reviewer and placed the tag on the collar where it is double (as I tried to demonstrate in the photo) and the lack of curve in the tag was a non-issue.
I feel like this is a great quality product for a very good price. I was really excited at how quickly it arrived! I've only had this tag for a few weeks, but it has held up perfectly so far. I chose the Georgia font and 4 lines of text. The engraving leaves a little to be desired (it's a little spotty - could be due to the font or size?), but it's completely legible so I can't complain.