I use Exactpower EP15A(filter/regenerator) and SP15A (balanced power) units since a few weeks.
Thus far i am pretty happy with it. To my surprise i could almost run my complete system on one Exactpower unit (the EP15 is rated 7.5 amps at 230 volts for Europe and the SP15 can do 10 amps at 230 volts for Europe)
Though they are expensive, they do deliver what they promise. Like Doody already wrote, the reduce the noice floor. My video is blacker than ever before, voices are clearer.

It was a bit of a guess, but it turned out very well for me.

Jaco

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