Flow Restrictor, Have you tried?

I bought this device: http://www.micromatic.com/draft-keg-beer/ez-balance-pid-802991KS.html from micromatic. I assumed it would be an easy way to balance my line on the fly by varying the pressure to the tap. I hooked it up and ... no flow.

Has anybody else tried this device with success?

Update:
I took the whole thing apart and put it back together and can now get flow through it. I am not sure what the deal was with it, maybe the o-ring was covering the outlet holes.

The design is super simple: the high pressure side flows into a chamber between two conical ends. By screwing the top and bottom together, the chamber becomes smaller and thus the pressure drop increases.

I haven't tried it yet in my keggerator to see how well it does at balancing.

Curious to know what happened, did you get this installed? Would you recommend it. more details desired =)

thanks.

Well, I eventually gave up balancing this way. I ended up using methods available online to calculate the necessary CO2 pressure.

I think you would only need the line-balancing tool, if you needed two significantly different pressures for two beers fed from the same CO2 cylinder.

I believe that balancing is very important, but it is better to calculate the required pressure rather than use something like this which would require a trial-and-error approach to get the right pressure.