leghorns are excellent layers of white eggs. However, they are not friendly at all. They tend to shy away from human contact. If you're looking for good egg layers, try RIR, but they lay brown eggs. JMHO
I have some White Leghorns I hatched from refrigerated, grocery store eggs (Trader Joe's) on New Year's Day. Three pullets and a cockerel. They are part of my large, multi-breed flock, and aren't old enough to start laying yet.
They are quite flighty, and shy. But they forage very well - my flock ranges freely on an acre - and eat less feed than many other breeds. From my study, I know they're going to be great layers. They're awfully pretty.
My Leghorn is one of my favorite birds. She is lead hen I think because she started laying earlier than anyone else. Her skittishness comes and goes, if I spend alot of time with them she will jump up on my lap for worms....if I am working alot she will start to become stand-offish until I sit with them for a bit and feed them. She lays almost daily...we had to take a small break from her white eggs while she suffered a pretty severe prolapse (don't know if this is more common for production layers like herself, don't want to deal with that to much more). Followed a bunch of advice from BYC'ers and got our first egg from her again yesterday after a nearly 2 week hiatus while recovering from her prolapse.
I like them a lot. But they are an active breed that is not given to being especially friendly so if you're looking to make pets that will come to you they are not the breed for you. Because they are so small and active they fly well so if you do something that would make a big dual-purpose hen jump the Leghorn will clear your head.