Personally I wouldn't bother with AWS.
While it does turn a tighter circle, it isn't enough to be significant, in my opinion. I trim around everything with the gas weed trimmer afterwards anyways, I don't need to rub the edge of the deck up against everything to try and save me from firing up the trimmer. Even if I am a good 12 inches away from a tree or object when I try to mow around, I don't go around twice. I just eye it up with the gas trimmer and trim it to level with the surrounding grass.
I honestly think one good pass of the entire lawn with the riding mower, and a good hand on a gas trimmer, is faster, then trying to trim everything with the edge of the deck.
AWS feels a little weird when your pulling a little cart behind you or if you have implements on. As one member said, I find it quirky and really not an advantage.
The X740 is about as bulletproof as they come in my opinion. It's a diesel, it's 2WD, and 2 wheel steering. There is no full time AWD like the X748 which has those individual hydraulic motors on each wheel. It is a complicated design that is likely costly to fix once off of warranty. In my opinion, 4WD is just not needed on machines these small, especially when they come with locking differentials. Throw on chains, some weight, lock up that axle, and those back 2 wheels will push you through just about anything you can steer the nose towards.
These are riding mowers after all, not tractors like the 2x20 series and up, where 4WD is essential.