Sillygurl: I have both the D3 and D4...one has 7 rows, the other has 9 rows. I believe the D4 has 9...
MsK: The Conair one probably works just as well. I didn't see tha knock-off until AFTER I had bought mine, believe me, I was sick about that. The Conair one doesn't even cost half as much as the Denman.