Well look what happened to Boromir...he entered...and came out changed. Thus, leading to his death.
I think the whole passage through Lorien is a test of will and spirit - if you fail, you might do something you regret, or even die. Yet if you pass, you go on to bigger things and you achieve greatness within yourself and in deeds. For that is what happened to the rest of the Fellowship. Although you could say that Boromir achieved a greater good...which I think he did, in the end. Totally.
