This doesn't bode well for Go-L. I mean, having a good machine is one thing, but the backbone of one's company is your service and support. If they're not taking care of matters now, I don't foresee them lasting very long. Ground vs. Overnight... that's a crazy mix-up. Someone was working in Shipping on a major New Year's hangover or something.
If they continue this sort of behavior, they'll find out real quick that pretty webpages aren't the only thing they need in order to build a successful company. Unfortunate to hear that they screwed this up. I was kind o' rooting for them to come through.
If they shipped it out UPS, did they provide you w/ a tracking number? If they can't give you a tracking number, then they're full o' !#$%! I used to work for UPS and when ppl would complain to me about not receiving packages, I'd ask them for a tracking number. More often than not, there never *was* a tracking number. It was amazing how many times companies told customers that it'd been sent, but actually hadn't. I'd be all over them for a tracking number. That way, you can coordinate w/ UPS, too, as for receiving it (since you'll be gone) or rerouting it to another address.