Are there website monitoring services that can monitor HTTP file download times?

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http://serverfault.com – The software company I work for would like to monitor how long it takes to download their installers (hosted in several locations and about 30-100mb each) from various countries around the world. I am aware of website monitoring services like Pingdom and Site24x7, and have contacted their customer services, but neither have the facility to monitor download times of such large files via HTTP. For various reasons, we are not able to rely on weblogs. Does anyone know of any third-party services that could help us? Many thanks. (HowTos)