I've got a fully adjustable, spring perch worxtuning recirculating BOV which is absolutely gorgeous (wrinkle red or blue finish with polished aluminum/ss.). Never had a problem with it, no stuttering, rough idle, etc. Great thing about it is I can adjust it easily so reduce the noise by recircing more air back to the compressor.
It's distinct in sound, but not "look at me" loud. To me, it's the perfect balance between announcing to those that know...yep, it's a turbo" and to those that don't you won't be startling old ladies into dropping their shopping bags.
Check em out. I highly recommend their service!!!