I always have a tough choice between free and vouchers. Vouchers I would use for any trip coming up, which is a good thing, but if the offer is for a trip then I look at it for a trip I would not normally have taken, not for one I was planning on anyways.

It's let me get to a few places that I wouldn't have gone.

My break point is in the $400 area, if it's under that then a trip is better, if it's over then vouchers, but I never argue with them.