So far, for me it's been a gift.
I've found an entire new "self". My old male self is still there (mostly), and is still the foundation of my life. But I now have an "alter-ego" where I can display my feminine side. When I'm dressed I feel very different and experience things in a different way. When I'm in my Male mode, I find my emotions, feelings and actions are more tempered, and I find I'm less judgemental.
But... I've not come out to my family (and may never), I don't dress publicly, and no-one knows apart from my wife. It's likely that this situation will never change.
So, yes, a gift, but one I'm keeping hidden.
Michelle.