A3, I agree that heifers are often times carrying our most valuable genetics, and in that, it makes sense to me to try to utilize those as much and as soon as possible.
Never have flushed a heifer. Mostly I'm concerned about what it might do to their future reproductive health, but I guess there are quite a few techs that know how to make it work. I've also always tried to stick to the theory of only flushing to an already proven mating. But, if I felt truly comfortable that it would not compromise her future reproductive abilities, I would be willing to do it.