Vignetting doesn't bother me much, I have a slim CPL. Even with the wide Cokin system added on top of that, I can go as wide as 11 mm (Nikon DX, which has 1,5x crop). However, with an additional B+W ND110 and the normal P holder, it's only good up to 14 mm. But at my current financial state, I can't afford the Lee system to overcome these millimeters. I just take a few step back and give up perspective. =/