These mains conditioning units have received a mixed bag of reveiews upon trawling the net. Just remember they were designed for protecting critical PABX telecommunications systems in commercial and public environments such as hospitals, not as a mains filter for hi-fi. They are built to a very high standard and I have been most impressed with mine which is a BT MCU 5A/1000 with four discrete mains outlets. It was decomissioned from an exchange system at a former hospital.
My only note of caution is that if buying these units, especially privately or from auction site ssuch as eBay, ensure that the seller has title of ownership as most of these units technically remain the property of BT as in the vast majority of installations they are provided under a lease agreement. Don't go falling foul of he law by handling what effectively may be stolen property. Most organisations such as hospitals, government innstitutions and large companies will give a proper exchange of ownership pro-forma.
These BT units will certainly give a discernable improvement in sound over no filtration of your mains supply. How they compare with more expensive and esoteric units from Isotek etc is a matter for your own ears and wallet/purse.
Please also be aware that these devices were predominantly used on telephony equipent which has a relatively low current drain and even the larger units such as the BT MCU5A/1000 only offer a maximum total output of 4.0 amps at 230 volts so do be aware of the limitations, especially if you're using high current drain power amplifiers. That output is total, so across each of the four sockets it is an aggregated 1.0 amps. Merely uprating the mains fuse will not surfice.
Many of these units are in excess of 20 years old and there are lots of modifications over the years with each model, but they are all built to a very high standard and reliability ought not to be an issue. They are primarily designed to suppres surges in voltage, rather than regulating the overall flux of power.
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