I just put a divorced 205 from a dodge in my K20 longbed, I need to go pick up the 3 driveshafts that were made for it. I wanted the divorced 205 because then I can use a non-cv style front driveshaft, the t-case is positioned so that the front and rear driveshafts are the same lenght which makes them interchangable, and I don't like the drive sleeve that is used in married units. I only run a 6" suspension lift, so driveshaft angle is not a problem for me, but a divorced case will allow one to to run a big lift and still have acceptable driveshaft angles because you can mount the case lower in the frame which means that the short shaft between the transmission and t-case will have some angle on it, then because the case is lowered the front/rear shafts will not have as much angle. 2 wd transmissions seem easier to find than 4 wd transmissions so replacement of a bad tranny can be easier, and swapping to a different transmission only requires a new diveshaft, not a new adapter/input gear/etc..., and the divorced dodge 205 has all 32 spline yokes for easy interchangability.
Now for the drawbacks - Mine requires a 9.75" long center to center of u-joint intermediate shaft (the one from the trans to t-case) using a long transmission and I have it running straight from the trans to t-case with no angle and this sets the t-case about 2" lower than it would be if it were married, and it hangs down right in the middle of the truck which gives a horrible breakover angle (is that the right term?), you will get it hung up on a lot of stuff if you do any serious wheelin'