Is the new GFB DV really better than Oem, people used to say they leaked some boost
Older models, before the revision, and certainly the fakes, did perform questionably. Vendor is key. Pretty sure Awesome GTI sell the new revision, which by all recent accounts responds faster than an OEM rev G, and should last for years.
Here's a pic I found showing the difference between a real one and a fake, although I'm not sure if the real one is pre or post revision.