Of course, I too have shipped my 'puter via checked baggage before. Let's see:
some years ago it was the ol 486/33 minitower from SFO to Cedar Rapids (change of planes somewhere). I'd bought it at one of these shifty places where the assembly room is also the sales room, and they gave it to me in the box the case came in, i.e., no packing. It was just withing carryon limits, but at the airport, they, uh, forced me to stick the thing underneath; the tag "fragile and unsuitably packed" did little to stay my fears.
at the Baggage Claim in Cedar rapids there's a window which, besides giving you a nice view of cornfields, lets you see them unload the luggage onto the belt. Sure enough, here's Buck taking my 'puter off the cart and throwing it onto the belt. WHAM.
Worked fine. I found out about a year later that the guys who installed it never even bothered to screw down the hard drive.
On the other hand, last fall I took a direct flight from FCO to LCA. I packed my computer in the original (plenty o' foam) packing, then packed that box in a larger one with additional shock absorbent material (I think I even washed it for once). Had them mark it fragile and horribly expensive.
On the other end,t he video card had unseated, and kept crashing the computer (tho' I later figured out, after having bought a new one, that the problem was alt-tabbing in WB 2.7X, a bug that's still crashing my machine). Oneo f my hard drives (screwed down this time) crashed a week later, and the CD-ROM on the same IDE channel is seriously FU'd.
You best be driving