Mine came yesterday. It installed easily on my Salvo 21W HID in about 5 minutes. Nice accessory even if you don't have a scooter.
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Right, I get that you have your four fingers free. Just trying to understand what you can do with them that's worth the purchase (for those of us without scooters). Again, pull and glide seems like one possible use (unfortunately, where I usually dive, that's almost never needed).
Certainly not required, but the add-on works real well for those that want it.
Another good application is for a reel work. When you wind up the reel (side handle) for a long time, it will give more freedom on your hands.