I've had bad luck with all of them, but Fed Ex by far was the worst... I've had them send things to the wrong house, the same wrong house, more then once....
i ave had the same problem at my house with fed ex. i ordered mustang parts from summit and somewhere else, 2 times in 1 week they delivered my shit to the house up the street.
they have done it at least one other time that i can think of with computer parts from newegg.com.
i hate fedex. we use UPS at work and i have no issues with at all. our normal pickup guy at work is really awesome too.