The Monsters also have outlets for mega-watt amps that do not limit current. I've never found the Monster to "harm" sound, on the contrary, the gains are there, but modest. Much better, though, than the Panamax Max 1000+ I owned prior to the Monsters. Panamax was essentially worthless in my system.
At the Good Guys near me, they have all the old and new Monster power conditioners with glass tops so you can see the guts. Indeed, the new versions appear to be better built. They look nothing alike inside.
If you have video gear, you will notice major improvements with the Monster. This is especially so if you plug your cable TV cable into the unit, it really "cleans up" the image. It's worth looking into the new Monsters IMO.