As a Sabre instructor, and someone who has been sprayed a dozen times in LE, I'll take Sabre 8 days a week....
Here's some interesting reading from Sabre about SHU's...the company VP David Nance is a chemist. I've spoken to him personally about this, and his explanation why Sabre is better is rock solid, imho.
http://www.sabrered.com/servlet/the-template/faq/Page
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NRA Certified Firearms Instructor
Utah Concealed Firearms Certified Instructor
SABRE Pepper Spray CSAP Instructor
www.ProactiveShooters.com