if you have a suck through setup, meaing you maf is before your bov, your car will studder and run rich between shifts if you vent. If you have a blow through, meaning your maf is after your bov, then you can vent or recirculate with no problems. This is because on a suck through setup air is aleady "counted" by the ecu, thus the ecu has calculated how much fuel to ad for that much air, if you vent it, the air will not be there.
I've never heard of the forge bov, but the 1g dsm ones work awsome, it holds boost great and is cheap. 1gguys dont have to upgrade, 2g spend ~50 to upgrade to one.