I don't own one of his products (am considering one though) and i have had no problems emailing him lately, in fact i have found he's been getting back to me within an hour or two usually. I have also heard he is more than willing to chat on the phone.
I would be a bit more forgiving when people don't reply to emails, there are usually numerous good excuses, such as its being filtered by the mail server or his mail client. if you really need to talk to someone, call them if they arnt replaying to your emails.
signed,
a guy that can rarely ever get clients and suppliers to email him back
