Having read this thread before purchase I filed down my prongs on all my cables before I ever inserted them and so far have been fine for several months. Hopefully you will be fine too.

I do worry about the port every now and again, but it hasn't stopped me from enjoying the device. Whether you think the device is worth the worry is up to you. If you're the worrying kind, you might want to consider buying some form of additional handset insurance, although really you shouldn't have to pay extra to cover a Nokia design flaw.