G'Day mate,
Closed loop boost controllers measure the actual boost pressure and then adjust the wastegate to suit (i.e. if the boost is low it will close the wastegate, if its high it will open it), it will continuously monitor the boost level and adjust the wastegate to suit. The EBC determines the required duty cycle of the solenoid by looking at the actual boost and comparing it with the target boost level (set by the user) and then it goes through some calculations and gets a duty cycle which it then applies to the solenoid.
I havent heard of the boost controller in that ebay ad so i cant help you there...
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