Of all the laser based system out there I'd give the GameCube the best score for toughness. I brought my second hand 3 year old (at the time) GC to a year long tour in Iraq, after 4 months the X-boxs and PS2s had to be taken apart almost weekly for cleaning because of the dust while my CG worked flawlessly. Draping the systems with sheets and towels, or putting them in boxes was also a common quick fix. Add on top of that bad power (black outs, brownouts, spikes, piss poor transformers and shoddy wiring) and other systems outright failed left and right. But because of my CGs brick-on-a-rope power cable and hatch-type disc access maintenance was easy. Yet I never once had to clean the lens, or replace the power cable or even place it in a "dust free" container. Its still humming along now just fine.
My one complaint is the eject button; of the two systems I own (one bought just for Iraq, cause I thought it would destroy it) both have broken eject switches, something I've seen and several other GCs also.