What is a "Meyer Lemon"?

I've read multiple recipes lately that call for a Meyer Lemon.  I always just use a regular lemon, not thinking there was a substantial difference.

I saw Meyer lemons in our grocery store last week and thought I better figure this out.

It turns out the Meyer lemon was brought to the U.S. in the early 1900's from China.  Compared to traditional lemon plants, the Meyer lemon is squat and considered an ornamental garden pot plant.

While still grown in China, California is a major supplier of our Meyer lemons.

Popularized by Martha Stewart, it is believed the Meyer lemon is a cross between a lemon and an orange, providing both flavor profiles.

I'm certain to try one in the future, but it seems to me that if a recipe calls for one, a mixture of orange and lemon juice will result in a similar flavor substitute.

Have you used a Meyer Lemon?