I'm female, and pretty indifferent. I mean, I thought it was cute, that there was a "human" Flash Sentry and a pony Flash Sentry, and the whole "meet cute" thing, where he and Twilight kept running into each other. It was nice of him to help Twilight out of a rough spot, but honestly, he didn't do enough for me to care.
If they bring him to the show, that's fine, I don't mind. Just give him more to do, and a real character, and I'll be okay.