I love unisex bathrooms and try to find them when I'm out. I like my privacy, so they're perfect for that.
I have had several odd looks, though, from people passing by as I go in/come out. Especially if there is a male toilet right next to it or nearby. I get the feeling they think I'm up to no good (drugs, sex, stealing). Why else would a younger guy use a unisex bathroom? But I don't let it phase me. I feel more at ease knowing no matter how the law reads, I'm in the right toilet.