If you only run a 2 inch lift, you can run a standard 2 joint shaft with a SYE.
major advantages to SYE's are;
Strength, SYE kits upgrade the rear output to a heavy duty 32 spline unit.
Not running a yoke partially pulled out of the t-case because of lift increases driveline strength, and reliability.
Ability to correct driveline angles.
Cheap tranny drops and other cheesy fixes can often lead to a lot of problems. Takes out ujoints, pinion bearings, bent driveline, smashed in and twisted t-case skids, trashed t-case bearings, list goes on.
An SYE also adds the ability to get off the trail mess free incase of rear end hassles, or driveshaft breakage. A none SYE case leaks its flud out the yoke end when no driveshaft is in.
Anyways. Im one of those SYE advocates. I'd run them on stock hieght jeeps because of the other advantages, but then again, I've also worked on a lot of jeeps, with a lot of issues from running t-case drops and bad driveline angles for extended periods of time.
My 2 cents.