soybean hay?

Any one have experience feeding soybean hay to horses? Pros/cons?

Some articles...
Soybeans for feed, food, and industrial products. : UNT Digital Library
Oh, and there can be a high risk of blister beetles.. So be careful!
Second paragraph here to :
http://www.ces.ncsu.edu/disaster/dro..._factsheet.pdf
If you have drought.. look here! http://www.clemson.edu/cafls/departm...ingdrought.pdf

thanks for the reply. Blister beetles are also found in alfalfa. I know years ago bean hay was popular. I'm still researching. We a re not drought stricken here in southern indiana but the hay crop has been hurt. Thanks again.