I have Furman Elite 20PFI and like it very much. I bought it used for about $650. It has very tight non-sacrificial over/under voltage protection and I believe that it filters HF noise well. My previous amp had plain unregulated power supply and did not suffer any loss of dynamics when plugged into it (high current bank). I have whole house spike protection, but Furman already turned off circuit breaker few times. When it happened I noticed bulbs got brighter for a moment. Now with double protection I feel very safe. Whole house protection is a must since everything these days is electronic, including appliances and even light bulbs, but Furman gives me extra protection for expensive gear.
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