Maybe this is the gear snob in me coupled with working in a shop for a long time, but I would never use a clothing iron on my skis. I like my skis, and I want to keep them happy. I've seen too many customers burn their bases because they used a clothing iron. Burning wax is one thing, but I would not want to burn my bases.
Like Rowen said earlier, a good iron does a super good job and lasts a long time. You don't need to go out and spend $300 on a digital iron, but spending $75ish on an iron will be a good investment especially if you wax your skis every week.