I LOVE my leghorns. My white leghorn is by far the best layer I have ever had in frequency, consistency and size. I plan to get more in the future and would have a whole flock of them if I had the space for more birds. I also feel like the are very curious and a bit braver than my other hens, which I enjoy. They were skittish when I first got them but I was able to tame them with a little effort and they all eat out of my hand now.
Downside: they can fly very well. Mine can get onto the roof of my house (I learned this durring a neighbor dog incident) and could easily clear a 4 ft fence even with a clipped wing. They do not wander out of sight of the rest of the flock though so while they would go for adventures they would stay close and always go back home. I now have them in a covered run due to hawks but used to free range.