You're going to get every answer under the sun on this topic. I run full length, one-piece rods in my 1911s. Do I think they're more accurate? Nope. Do I think they are maybe more reliable? Nope, probably not.
It comes down to me thinking that I like the IDEA of a full length guide rod. It just seems to me that it is more "precision" that a spring of that size has a nice smooth rod to slide on. No side to side motion, no problems anywhere. And before you ask, no I never had any problems without the guide rods either!
I just LIKE them. It's a very subjective thing.
I can't cite any study or scientific reason why a guide rod is a good thing. I simply like them... and Greg528it is right. Your pistol is NOT harder to take apart. Anyone who has owned a 1911 for a little while will be able to take it apart just fine.
I only have ONE conclusion based on personal experience regarding guide rods... a 2-piece guide rod CAN unscrew itself while shooting. It has happened to me. It loosened a couple of turns - it never fully came apart. So... I only run one-piece guide rods.
Now, the $64,000 question... do you put a shock buff on there too?
I do, and they work just fine too.