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No difference, I am actually back to the factory one due to a trouble shooting process. The problem was not the BOV but since it makes no difference, I have not changed it back. Dont feel bad though, I still think is money well spent, the factory will go bad or may already be bad in which case you could see some improvement if it is heavily leaking boost.
The BOV bleeds air from the intake side that gets pressurized (From the turbine to the intake manifold) to the unpressurized post metered intake air (from the CIS meter plate to the turbine). The BOV registers over pressure in the presurissed chamber due to the throttle body plate closing and bleeds the air out to prevent the turbine from stalling and also, in the long run, it prevents damage to the turbine due to the same situation.