Is it true that the zowie mice (except maybe the mico) have "input lag" at lower dpi ?

I've read somewhere at overclock.net that the AM (and then the FK) has "input lag" or mouse smoothing at 450 and 1150dpi but not at 2300dpi.

But what I find strange is that from my own experience there's almost litterally no difference between those 3 dpi steps. From my own experience, I didn't feel any input lag at all. But maybe it's because i'm too noob to notice it ? :p