Yep, had that happen to me. Box started in California, made it here to Texas, thought I'd get it next day. When I got home, it wasn't here, went online to check tracking, it had gone to New Orleans!! WTF??
Next day it was delivered, after they turned it around and got it back to TX.
Oh, and when I e-mailed them about it, UPS said it got here in the promised 3 to 7 days, so they did what they'd promised to do. :\
I figure, with the incredible amount of packages they handle every day, this is acceptable, as long as it's not happening more than once or twice.