Hi bbondaloose.
the xpacks/booster packs are really not worth the money IMHO, BF2:SF is ok, but the booster packs, PR offers everything that is in the booster packs apart from the maps, which no one plays them. More people play PR than all the booster packs combined, and some times at peak time, the booster packs and the xpacks.
On ther booster packs quality, quick example, here is the Challenger 2 tank from the BF2 Euro Forces booster pack:
And here is the Challenger 2 tank we made for PR.
And here is a real pic of a CR2:
so ye, is it worth paying extra money for that when you can get a much better one in PR?
If you just want to buy BF2 to play PR, dont bother with any of the booster/xpacks, unless you can get them for free
Having the xpacks/booster packs will not make any difference when playing Project Reality btw if that's your main question.
Hope that helps and welcome to the forums
