ordered 3/08/13. put to use immediately and was getting to know 'normal' temps after rides..
yesterday 4/21/13 the sensing unit fell off my belt hooked key chain (case vibrated loose) and the little batteries rolled down the nearest storm drain.
I am happy with what the unit did. Will probably reorder.
I recommend lock tite application to the screw threads when inserting the batteries. Then your unit wont drop off like mine did! (Posted on 4/22/13)