I have the BD BOV installed and it works great for me and my configuration. I have a daily driver and sometimes weekend racer. Michael at HotRodDiesels.com installed mine. The install does look like a major PITA for sure, that why I would not have even thought about doing it myself. Proper installation and calibartion of the settings seems to be what is needed to make it work correctly.
Before the BOV my II SPS66 barked all the time just daily driving. Entering freeways, beating the mustang to the turn lane, etc. Now I have no barking on the street, just the ocassional pssst, pssst, pssst. Much better on the nerves and the turbo. It is an expensive solution for sure, but I am happy I did it. Just my . 02.