I did a quick test on Friday with one of my Lee filters ND grad's for timelapse...

https://vimeo.com/62413221

Here I used a 1.2 Lee Hard ND grad filter which equates to a 4 stop graduated filter. I have a 3 and a 4 stop soft grad also, but the hard is quite nice for a more abrupt graduation from the sky upwards.

The effect almost looks semi - HDR, giving more detail than my 1DX could capture in single frames.

Great for sunsets also, plan on using it with my dolly etc more and more often. Definetly happy with purchasing it!

Yep grad NDs were the best thing I bought. Very rarely shoot a sunset without one.

Nice sequence. Blue mountains has some good places to shoot hey. I been getting up there a bit lately.

actually been a while since ive been to the Blue Mountains, this was shot at the top of the escarpment in Illawarra about 20 mins from my house
Im keen to go up there again with a dolly and do a sunrise on a clearer day, you can see the ocean when the wind direction is right.