I just read some of your replies and wanted to add that I feel that if the surfer has intentions of doing chargeback they will do it regardless , yes the precheck cross sale may spark them to do it even more but than again we have chargebacks for even a buck thats right 1dollar ....
However , since we been using it , the chargeback ratio surprisingly has not been off tha hook . A big part of it depends on WHO (which sites) you are sending to as well .