Worth every penny of it. It's cheaper to book coach then upgrade when you check in. To book biz class, your fare will be close to 3x more than the coach fare. So if you are flying to say ATL-BOS, the coach fare is $79, while the biz class fare is $244 (each way). Before all of the taxes and fees, that comes out to $158 RT in coach, and $488 in biz class. Now if you upgrade your coach ticket both ways, that brings your cost up to $208 dollars, which is a savings of $280 over the biz class fare. Now this was for a flight that left ATL @ 8:30 in the morning, some of the later flights are a little bit higher for the coach fare $99-$129 each way for coach. You get more legroom, a more comfortable seat, snack mix in a bowl (instead of in a package), and two free 'adult beverages'. Pay the $25 upgrade if there are seats available in biz class.