Right, I've heard a few things about GABA both good and negative, but so far, I've had no bad experiences...as I knock on wood, lol.
L-Theanine, I've taken along with Passionflower and Valerian (combo) and it seems to take slight edge off. But as far as tolerance and withdrawals re: gaba vs. L-Theanine, I'd agree with you, the L-Theanine seems to be the safer choice.