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From a strictly mental aspect, training to failure is a bad idea.
If you come to accept the notion that your spotter will assist you on the last rep, you will actually quit before your body needs to.
When I benched heavy I always asked my spotter to step back from the bar and out of my field of view. He would only be one step from position. (When I went really heavy I had 2 spotters; one on each end of the bar.) This accomplishes two things: 1. If he is all sweaty it keeps the sweat from falling into your eyes while lifting (this has happened to me). and 2. It makes you psychologically independent. You have to finish the lift or you are in trouble.
Additionally I always instructed my spotter thus: If I need help, I'll say, "take it" at that point I will have nothing left so just haul it up--I don't work out the last rep. Don't touch the bar or step up to the bar if I am struggling unless I say, "Take it".