my power for the studio travels from wall > furman ar-1220 (voltage regulator) > furman it-1220 (power transformer) > furman pl-plus (line conditioner)
so, 3 furman products before any power reaches my equipment.
as for benefits, there isn't that big of a difference. furman claims that the balancing transformer can drop the noise floor by about 15db... but i didn't notice much of a difference, even with a lot of my equipment on at the same time. the voltage regulator is good to have as insurance, but also, it doesn't do much for sound.
so, some people swear by these things.... to me, they are more of an isurance policy... to make sure nothing here gets fried. perhaps they make a difference..... but i sure ain't gonna dig around behind my racks to test. you can ask the people that went to my meet in the 2nd.... it's near impossible to get at the cables in back.
however, furman isn't the best out there... other pro audio companies like surgex make higher-end stuff. though, in practice, even million-dollar big-time studios use Furman power products exclusively. in general, pro audio products are better deals than audiophile stuff. less ********. more product.
one thing for sure..... if lightning hits this house, my studio might be the only thing left standing!