There is currently a helpful thread on this topic at the SSCA Discussion Board - http://ssca.org/sscabb/index.php?action=vt...um=6&topic=2309
To quote from one very experienced contributor: "First, [the Pardeys] also have an extremely full keel and no roller furling which both help. Second, they use different technique (the bridle) than the manufacturers primarily suggest (straight over the bow). The bridle technique is even more difficult to implement on a biggish boat – there is no stock snatch block available that is strong enough to handle the loads so you need to use a somewhat different approach (a spliced bridle) and finding chafe free/strong enough attachment points for this bridle (which can take loads of about 75% of displacement) is difficult." BTW this was from a fellow who spend a good deal of time in the Chelian Canals with the Pardeys and discussed all this with them.
For those who have access to the USA's Cruising World magazine, there are two excellent articles by Beth Leonard in the Dec issue on rigging, deploying and recovering a drogue, and on forereaching & heavying to as storm tactics. These are excellent because Beth and her partner Evans (the fellow I quoted above) have sailed many miles in the Southern Ocean and elsewhere and so their experience base is deep. This becomes clear when the describe how all these techniques vary considerably in their influence on the boat, just as Bruce points out, because the boats themselves vary so greatly (let alone the sea conditions).
To modify something John stated, drogues (both low speed and medium speed) have a very different purpose than a chute anchor. One carries them for different reasons and so it's not a simple matter of which of the three you pick from, altho' that's in fact often what happens.
John, because you said "If anyone out there has positive experence using a sea anchor on a medium / light displacement monohull I'd love to hear about it..." I encourage you to get a copy of Victor Shane's Drag Device Data Base (ed. 4 or later) which is filled with first-hand accounts of using all 3 devices, by vessels varying in side, # of hulls, and rigs. I find those accounts to be extremely provocative for me in ID'ing issues and thinking through choices. I'm sure you would, too.