I can speak a little bit about the Niagara power conditioners. The 7000 is much heavier. I have all my sources plugged in to the low current outlets. The unit has worked flawlessly. For my amps I use 1 5000 per channel. No sources are plugged in. I run them in standby mode. Although I run the 7000 in the engaged mode I have not noticed any increase in my electric bill in so doing. As far as sound improvement as you might imagine I experienced a significant improvement over my 20 year old MIT gear. My installation was difficult and time consuming. I did not have the luxury of comparing the 5000 to the 7000. If you can afford it the 7000 is definitely the one for sources. The 5000 is similar to a 1000 regarding sources. Again the 7000 is twice the weight of a 5000 but there is no difference in the high current section. I like these units and plan on keeping them for a long time as I did for my MIT gear.
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