A/C Advice. factory or not?

[cstanley]

i currently have a fully functional (albeit empty) factory a/c in the truck, but was wondering if it's worth installing one of the aftermarket a/c setups (i.e. vintageair, rodair, etc.) the system works nominally, and will hold a charge for about one cooling season (that's 50 weeks in texas.) freon's getting harder to come by, plus the truck is already doing enough environmental damage. i understand that a r134a conversion just isn't as efficient, and there's also a new type of refrigerant out?

what's everyone's advice (particularly those who know what both systems actually feel like, before/after, etc?

thanks everyone...