It seems that the 'worldwide' claim a bit of a stretch. I can only search for an iTech in the US and the front page has a US map on it. (Though it seems you can sign up to be an iTech worldwide.)
Cgislason,
We have a GeoIP service on the site so when your in other countries, our iTechs show up for those specific countries. We are working on broader integrations as well, apart from expanding 4-5 new locations a week.
We also get a ton of mail in repairs from around the world in places we don't have iTechs yet. This has been very popular for US military abroad which we offer extremely discounted prices to get their devices up and working again. We are trying to expand as fast as possible now, so any referrals for iTechs are greatly appreciated!
It might even be worth buying an ad in the deployed Stars & Stripes (CENTCOM; I think you can buy Afghanistan + Kuwait + Qatar + Bahrain edition as a package, and it's not that expensive CPM). This is a perfect service for that market -- when I was overseas, we did this informally based on my purchases of bulk supplies and air force biomedical equipment techs with spare time. The only tricky part is the fee for service thing; it's fine to do cost recovery, but charging another soldier for service sometimes runs afoul of policy. Running the payments through your site might help with that, I'm not sure.
We also get a ton of mail in repairs from around the world in places we don't have iTechs yet. This has been very popular for US military abroad which we offer extremely discounted prices to get their devices up and working again. We are trying to expand as fast as possible now, so any referrals for iTechs are greatly appreciated!