As a guitar trader I use IP a lot of the time because its main services are carried out by UPS. Excellent with guitars, and only one (small) slip up so far. IP admin can be a pain if there is a problem, as they immediately go into denial mode, but usually things go smoothly so no need to phone them. I have learned if there is a problem to contact UPS direct, and they are excellent at resolving it (as opposed to making up excuses, or guessing). Pros: UPS runs the service Cons: IP will not insure over £1000 item value so I have to use rival company p4d to access FedEx and £2000 worth of cover for many instruments - this is IP's loss.