I booked a flight CLE - ORD today, and was given the yellow button option to "Increase Ticket Flexibility for only $xxx more" and get a fully refundable/changeable fare. I clicked the button and was taken to the screen for payment. The fare class changed to M for both outbound and return. However the rules section said "This ticket is non-refundable and has a fee for changes" and when I clicked on the rules link, filled in the CAPTCHA, and went to the rules page, all the rules boxes on the right side were blank. Not feeling good about this, I cancelled and started over, using the blue "Refundable fare from $254" link that appears atop the search results. The fare class changed to M, and this time the rules section said "This fare is refundable" and the rules page was properly filled in.