Not to muddy the waters, but, well I am gunna do it anyway! The load rating for a chain reactor depends on configuration. End to end and basket it fails to meet ANSI Z 133 standards. (not to quote pro jargon, but it does give a good baseline for general safety) In a choked configuration it exceeds the standard.
Moss is entirely correct in recommending loop runner for this application (function over form). However, do not dismiss a piece of gear without understanding the concepts behind the application. That, in essence, is the beauty of the climb.
Tony