Hey guys I bought a sigma last week and I am so glad I bought it. It only cost like 25 bucks before shipping but it was worth every penny. It was an easy install. All i needed was some EARTH MAGNETS from Radio shack. They are so strong they wont leave my rim even thoug only 2 are glued on , a total of 4 were used.
Anyway here are some pics
http://www.bikepics.com/pictures/402321/the sigma unit
http://www.bikepics.com/pictures/402322/the sigma sensor under the front fender, the rust is the magnets. U can only have less than 1/2 cm of space between the two.
http://www.bikepics.com/pictures/402323/ I noticed the Sigma didnt have a light and couldnt use it at night. I bought a book light from CVS for 5.99 and mounted in on the gas tank with double sided tape. Now if I want light I just flip it up and close it to turn it off. It works great and is adjustable, plus wind doesnt bother it.
http://www.bikepics.com/pictures/402324/this is a pic of the book light open
http://www.bikepics.com/pictures/402325/this is a pic of my bike with new tool bag. check out my funky filter.. I am thinking of putting some white led's in my saddle bags so at night I can see whats inside before I put stuff in there and ect.