The vast majority of 'power conditioners' are basically 4-way extensions inside a rackmount unit. You basically get a surge protector, an EM filter, and maybe a rack light or a little voltmeter.

The only way to actually 'condition' your power is to use an inline sin wave UPS. Fortunately these have become inexpensive these days, so do that, rather than pissing around with a Furman.