Answered this over on the Resort Board. My advice is to do the upgrade. The value resorts are going to be full of teenagers that week - Pop Warner Football players and cheerleaders. Pools, food courts and buses will all be packed. You'll enjoy your stay more at the CBR. There may be a few Pop Warner people there, too, but they are more likely to be family units rather than groups of 4 teens /room. Pop Warner doesn't have all that much impact on the parks, but the large number of teens does have an impact on the atmosphere at the value resorts.
best wishes -