I would like to see it in acton.
With Blichmann's reputation it's hard to imagine them releasing a flawed product, so I wonder what the deal is. Maybe the expectations are just too high, or maybe it's all user error (ie not using the product exactly as it's supposed to be used). The instructions are pretty specific:
Blichmann Engineering Hopblocker]
2. Ensure that the shield is pushed all the way to the bottom of the screen and the HopBlocker is resting resting flat on the bottom of the pot. Proceed with your boil as you normally do. THe HopBlocker may move a bit during the boil but this is not a problem as it will automatically right itself.
3. At flame-out stir the wort vigorously with the stir paddle to create a whirlpool which encourages the hops and trub particulates to settle to the bottom center of the pot away from the HopBlocker.
4. Allow 15-20 min for the thermal convection currents to slow and allow the break material and hop particulates to settle.
5. Drain your pot as fast as you'd like until you see the top of the kettle drain fitting (about 3" of wort)
6. Reduce the drain flow rate to about 1/3 the initial flow rate. This allows the wort to permeate through the hops and trub and enter the filter screen to be drained
7. Use your stir paddle to hold the filter down and quickly pull the shield up with a gloved finger or a racking cane (or similar) so that it is out of the wort completely. It is important to move quickly through steps 6 and 7 so you do not lose the siphon which will stop the flow.
In my case it will never work. I use a keggle, so it will not sit flat on the bottom. I also don't whirlpool and let it sit for 20 minutes to settle, I just run it off into the chiller.
<edit to add source of quote>