I've played it several times to non-caving friends of mine, and without exception they've been impressed and very entertained. The 'A-Team'-style caravan with the drop-down wall and hidden winch is genuine cinematic magic - as is also a tiny spot of glamour, as one of their girlfriends or wives (perhaps it was Margaret?) is briefly glimpsed before it's obviously realised it's meant to be 'mainly for men' ;)
The Titan film Dave made was also equally well-received by friends who have absolutely no interest in caving, so Dave is certainly doing something right.