pigman is mostly on track, daddy not so much...at least that's my delta experience.
heavy? absolutely. need a forklift just to get them up on the bench!
pain to setup? absolutely. practice helps, but it ain't ever easy.
$$$? check. have a look at eBay...
aero cable routing? not exactly the brake's fault, but yes...poor lever design.
pads? i pulled my campy pads immediately, in case i ever want to sell. i'm running kool-stop salmon replacements and have no complaints.
i'd add noisy to the list. the pads require a fair amount of toe-in to prevent an earsplitting shriek. and toed in so severely, they get a bit mushy. with a pad swap and a bit of fiddling, i seem to have found a happy medium however.
i've also read terrible things about noise / stopping power / lever effort, but i must insist that in my experience, none of this is true! i have the last generation (with the 5-pivot internal linkage...see 'em on the green scapin a page or two back). They lack the effortless grab of modern dual-pivots, but are still perfectly capable of pitching me over the bars. i'd wager that they perform better than many other brakes of a similar vintage. is it the 5-pivot design? the pads? my painstaking 'expert' setup? i dunno...
one trick that i learned from campyonly.com is that the stopping power is much improved if the pads are as low on the arms as possible...drop 'em all the way down and move the whole caliper rather than the pad holders to align them with the rim. also, set the pads a little further from the rim than usual...yes, this equates to more lever travel, but also more power.
$0.02...