he was pretty decent during the bull run, when making money in commodities was a nobrainer. He also predicted the oil crash of July. For the rest, I see all his picks in the last months deeply, deeply, deeply (up to 97%) in the red. Both those in the previous service RTA and in the new service GCA. I would rather recommend other newsletters like MoneyWeek or sirchartalot, they provide a much more complete and accurate coverage of the markets and are better value for money, although they don't explicitly recommend any trade. I also find quite decent the Options service by Steven Sarnoff. I would assume that the Summer 2008 crash took many seasoned traders completely off guard, Kevin Kerr is one of them I would say.
On top of that, he has provided almost no coverage of this big crisis, leaving his subscribers in the dark. This is not what you expect from a trading advisor when you pay a hefty 900 and something dollars a year membership.
On the bright side, he sincerely makes an effort replying to individual emails. He is a good guy, but this is not enough to be successful in trading.