As far as I know, I haven't had any trouble whatsoever with the system that is in place currently. I don't have a problem with moisture buildup, but it gets sweltering hot in the attic during the summer months. The attic is used for storage only. The roofer said that he could install a ridge vent for around $300 bucks while the shingles were being replaced. I figured that would be a pretty cheap addition. If it will be beneficial, I'll do it. If it won't be helpful, I'll hang onto my $300.