IRO seems to build a pretty good wheel. Mine was true and properly tensioned right out of the box, and the first time I needed to true it was after ~6 months of daily riding. That being said, I'm not that heavy (140lbs, i think), and I try to be nice to my wheels.
Anyway, before you go ride any new wheelset, you should always check the spoke tension and trueness. You don't need to take it to the shop for this, just eyeball the rim once you have it on the bike, and make sure it spins true. For spoke tension, grap two parallel spokes and squeeze them together, and keep doing this until you have tested them all. Anything obviously loose should be tightened. If they are out of true, they should be adjusted before riding.
After riding the first 100 miles or so (less if you are using it in the city), check everything again, since trueness and spoke tension often change during break-in. Adjust if necessary. If you aren't comfortable doing it yourself, this is the time to take it to the shop, but I would advise everyone to do some internet/bike forums searching and attempt to learn to true your own wheels. It's not that difficult, and it's a great skill to have.