I voted yes, but only if attractive and interesting. Because those would be my requirements for any relationship. I wouldn't date a trans BECAUSE he/she is a trans, but because I like him/her.
I don't care about children yet (I don't feel ready...) so that's not an issue. My legacy? I might go for adoption anyways... I don't trust my genes..
Sex? I don't know how good they are. Is it possible to "carve out" (lolol) a vagina in a man? My first guess would be yes, in one way or another. But what about the g-spot, and the clitoris? What about orgasms in general? I really don't know, I'm just assuming that it kinda works. Magically.
Either way, pre-op still sounds interesting. I'd never identify as gay or bi, but when it comes to sex, well, lets just say that I'm open to suggestions.