The proper term for people taking these actions is not "hunters", it is "vandals."

I have been lucky enough to use Aeron chairs at work for about the last ten years. I think they are pretty good - far ahead of most others I've tried. (Another poster mentioned issues with friction adjustments and I've encountered some pants fabric wear due to the mesh - but the breathability is a huge boon for me). However, when I bought a chair for this purpose for myself I got a Mirra instead - and I like it better than the Aeron. But the best advice is to offer to buy a chair that he picks based on trying several - everyone is different and my perfect chair may not be the right fit for him.