Well, as the last game I just posted on this thread points out - I'm enjoying using it! Also, until I encounter clear irrefutable defences to it, I think I'll continue to explore its variant lines of play and, if possible, perhaps work on it a bit, maybe 5-10 moves down the line.
If it is so clearly dominated as suggested by some, then it should basically be a 'dead' line. However, I've seen no clear line of response that guarantees so. All I've heard are statistics, which I've investigated, and like I've said, even those master games showed much less follow up on black's part to use the aggression created by Bird's defence to its maximal advantage.
Not that I'm a master or anything (VERY far from it!) but I honestly think that this last posted game of mine made far more use of the tempo/aggression needed to make Bird's Defence still useful.
At the amateur level, anything's playable. And this is probably more playable than some of the worse stuff amateur's try (Englund Gambit, for instance). As mentioned above, a few top players have used it here and there for surprise value, but it's not good enough to play against that level of opposition regularly. From what I've seen at local tournaments here, it's actually a popular line among low level players (<1200 USCF) against the RL.
--Fromper