What has made CBX popular are the cratered Peso resulting in extremely low airfares out of TIJ to much of Latin America (and especially to destinations in Mexico), as well as the still prevalent belief that the San Ysidro border crossing has massive waits. But since the opening of the new West Pedestrian crossing into the U.S., the pedestrian lines back into the U.S. have become much more manageable. OTOH, the pedestrian crossing INTO Mexico at San Ysidro has become noticeably worse, as the Mexicans have begun to slow down processing, apparently to protest the various Trump Wall messages coming from Washington. But there's a workaround to that, which is to get an FMM180 in advance of the trip, the possession of which will allow you fast access into Mexico along with Mexican nationals. While not officially so, the FMM180 is actually treated as a re-usable multiple use tourism card for frequent crossers by the Mexican border patrol in San Ysidro, and they won't make you surrender it before leaving MX, so you can use it again and again crossing back into Mexico. I bought mine about 4 weeks ago and have used it multiple times, including for my TJ to SJD trip this week.

The FMM180 can be gotten in person at the San Ysidro crossing or online, as well as at CBX. I don't know if they make you surrender the FMM180 coming back into the U.S. via CBX. They certainly do not when crossing back into the U.S. via San Ysidro