I found this while I was researching driveshafts for my car (I spun the bonded rear shaft). It seems like reliable info, they got their info from Inland Empire Driveline.
http://www.rodandcustommagazine.com/techarticles/0608rc_driveshaft_tech/viewall.html
They tell you how to check the angles on a 2pc shaft to make sure it's set up right. They also get a little into what applications need a 2pc instead of a 1pc.
http://www.rodandcustommagazine.com/techarticles/0608rc_driveshaft_tech/viewall.html
They tell you how to check the angles on a 2pc shaft to make sure it's set up right. They also get a little into what applications need a 2pc instead of a 1pc.