I have a civic/dc2 REV SPEED magazine somewhere at home, which has a feature on staggering wheels....
They do some pretty serious/thorough testing at a track in Japan, with a professional driver, and a moderately track prep'd EK9 and DC2.
They try a bunch of set ups, from about 15x6.5 all the way up to 17x7 (if I remember correctly..)
Anyway, basically, the bigger they went, the faster the lap times got, and not only that, but the staggered setups were all the fastest. It seemed to leave no doubt in mind that these setups are the best.
I think people sometimes do not like them because they are 'odd', not because they do not work....
I am not sure how much power you need/how sorted your suspension needs to be, before these setups start to make a noticable difference, though, but the lap times in the test I read, were really significantly different...like, half a second, or almost a second from the slower laps to the faster ones.....