I haven't had time to try my VACs yet. The owner refers to them as "compression before your voice reaches the mic": use one or two screens, and place them closer together or farther apart. He clearly sources the high-quality metal gooseneck from some other application and has adapted it for his Popless screens. (This is a good. No need to re-invent the wheel.)
In practice, the ability to place the VAC Popless screens "closer together or farther apart" is quite limited, since the plastic hoops snap into one of three fixed slots that are right next to each other on the holder. In general -- as with any good accessory -- you are paying more for the quality of design than you are for the parts.
That the hoops themselves (and the holder) are lightweight black plastic may make them feel "cheaply made" for the price; however, I really don't want anything substantial or heavy in close proximity to my favorite mics anyway. If someone accidentally bumps a VAC Popless, it may pop out of its mount, but it's not likely to damage the mic (or the screen).
I'll gladly submit a follow-up report once I get a chance to experiment with them. I got the larger generic dual screen version on the gooseneck as well as an all-plastic version designed specifically for use with the E-V RE20 or RE27 in the 309A shockmount. One thing I like about the latter is that the screens stay on the shockmount, so I can still put
the RE27 away when not in use without having additional parts lying around.
Purchasing directly from the manufacturer was prompt, courteous and reliable. I believe they are also carried by Broadcast Services Worldwide. Order from whichever doesn't charge tax in your state.
Best wishes,
Mark H.