It's not the most powerful engine, the early years of active fuel management (displacement on demand) had a few hiccups, but I hear story after story of very high-mileage 5.3's.
Bottom end is built very well, slightly oversquare (most of the cubic inches come from the bore) with a tough 6-bolt main. If you compare the bigger rods of a 5.3 to an older 350 it's night and day. Like I said not the most powerful, but It is a very solid, reliable motor. I have a theory that oversquare V engines last longer than undersquare V engines. I have no scientific evidence to base that on, but I will never buy an undersquare v8.
From my comparison the 5.3 has less vibration than a 6.0.
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