I think I damaged the LA-EA2 adapter; I'm not getting particularly sharp images with the Sony 70-400 or an old 400mm prime. I'm also noticing the autofocus isn't quite as good as it is with the native "E" mount lenses. I just sold all my "A" mount gear, and now I'm regretting it. Don't get me wrong, I still love the a6000 and the FE 70-200mm F4 G OSS lens with it is a winning combo, if the animals are close enough. I broke down and ordered a new a77 to use with the 70-400 (it was less than $600 at B&H).
I'm conflicted about doing this, as I really do prefer mirrorless. I'm just waiting for Sony (or any lens maker) to make a native "E" mount 400mm or above. Seriously, give me a 400mm f/4 and I'll be the happiest guy in the world! Are you listening, Sony?