I use the PureAV because it was nicer than the Monster. I made the guys at Best Buy hook both of them up side by side and I then A/B them back and forth.
TRUE STORY!!!!! LISTEN ALL YOU UNBELIEVERS!!!!
Case 1: In my apartment last year, the power was horrible. When the neighbor was running something of his I could tell because there was buzzes and odd noises. Not loud ones just faint ones. But they were annoying none the less. I got the conditioner and IT STOPPED, plus the RF noise that was screwing up my TV almost went away!!!
Case 2: I work for a sound and communications company, so over the summer I brought my conditioner with me just because I was still some what of a skeptic. We were at Bowling Green, Ohio at the Nation Tractor Pulls and the Power SUCKS every year there. We end up running isolators for signals, and line transformers to get the noises to go away. So instead, we ran all the audio Equipment off my Conditioner, and every little noise that we had before WAS GONE!!!!
Case 3: The communications side of where I work does Two-Way radio rentals, and we rent out 2 different types of repeaters, Kenwood TKR-820 and TKR-850. These repeaters are both very clean sounding and are noted as one of the truest sounding repeaters. However at 2 locations, Red Bud Motocross Park in Buchanan Michigan (former home of EV) and again at Bowling Green we had noise problems. We installed Tripplite conditioners/protectors, and the noise went away! Go figure.
Say what you want, but I KNOW they work.