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I ran the Bosch +4's for about 25,000 miles straight and never had any problems with them either... I ran Autolite copperfor the next 10,000 miles, and I've ran Champion copperfor the last 45,000... and I can honestly say, I saw no major difference betweenany of them in any category. The only difference I thought was the +4's idled a bit smoother, but then again that was when the motor was at it's newest...
I say as long as the plug is put together correctly and gapped appropriately, I am not sure if it really matters in a non-turbo 2.0. 44,000 volts will jump into your finger and come out through your toes, so jumping 0.035" between two pieces of metal can't be a huge difference from plug to plug... not usually it seems.