Seconded. I'm also Irish and the new postcodes are the ultimate in clarity imo. Each dwelling/unit has one code, and each code represents one dwelling/unit.

I live in quite a remote spot, so before, my address was just my name + the general area I live. Thats fine for the postman who knows where I live, but I dont know how other delivery services figured out where I was. Also I'm pretty much at the centroid of 3 towns, and different services would route deliveries via different towns. I had to learn through trial and error to put 'via X' or 'via Y' as my address depending on what service I was using.

Eircode clears all that up.