Not to knock Furman, as I am unaware of the quality of their products, but they were sued by one of series-mode companies who holds the patent on series-mode protection, regarding Furman's claim to using series-mode. The patent-holder (Surge-X, I believe) had not licensed it to Furman and claimed in their lawsuit that Furman was providing MOV-based protectors while claiming series-mode.

A settlement was reached in the case but I don't recall the details.

Pioneer VSX1014-TX HK DVD31 M22ti mains VP100 center M2i surrounds SVS PB10-ISD