Looks great! That's a really nice pattern too!
I did one with a wavy border and I did my figuring manually too. But I liked it so much, I bought the wavy ruler when it was 1/2 price (on sale $10). I haven't used the ruler yet, but have a quilt in the works that I plan to use it on. I figured it was worth the price since I know I'll use it. It was my first bias binding too (that was a trip)...I read several versions of directions, but didn't really "get" the instructions, so I kind of winged it. I have since found some directions that I understand, so I will try those when I finally get that one done.
Thanks for posting pics, you do such a nice job! :)