Summary: we use Skype for calls at work and I, along with several colleagues, was given this Philips headset to use with it. After a few months daily use, I'd say that the sound quality is very good (both in terms of what you hear and what it picks up) and the set is both robust and durable (these get lugged around in rucksacks too). My co-workers have made similar observations, so its not just me.
Pros: Good sound quality; Good build quality
Cons: A bit uncomfortable; Doesn't fold up for transport