Ask HN: Anyone used an iPhone development company?

We've got an extremely simple iPhone app we need developed to go accompany our website. My co-founder and I are too swamped with rails / android coding to do it ourselves. We've got wireframes and pseudocode written for the app, and suspect an experienced dev could knock out our app in 15 hours. Has anyone had used the development companies (e.g. iPhone Sculptors, TeraCode)? Whats their quality of output? Would they be a better fit for our type of project vs. just finding an freelancer?