Blow off valves are blow off valves. Purchasing an aftermarket brand name BOV doesn't always mean its a quality product. Leave your stock one on unless its leaking. There is no performance gain in adding an aftermarket one. Save up for a worth while modification that you will benefit from.
Sorry didn't answer your question very well. Yes the Bosch BOV's are decent. I had a friend with one installed on his VL Turbo and it was loud. Did everything a BOV was supposed to do.