I like the Walkera 400D rotor blades on my Big Lama. They are the best I've tried (and I've tried most). All the others are too flexible or too fragile.
I finally got around to trimming and installing the 400D blades. Trimmed aprox 15 or 16 mm from the end of each with strong scissors, to match the length and aprox shape of stock E-Sky blades. The width is about the same as stock with no trimming. Checked balance on a digital scale. Had to use a small washer as a spacer in the blade holder; 400D blades aren't quite as thick at the root.
They are much stiffer (a very good thing), a little thicker and a little heavier than stock. Hopefully I won't find out too quickly how tough they are. They fly nicely and have plenty of lift. I'm using them with Brushless, so only guessing they would do fine with stock motors.