I often fly the 737 using CWS to control it. Especially after takeoff and when capturing the ILS/GS. I find it very good. I only have some minor issues with it. These are:

1. I want to do a turn with a 20 degree bank, so I start banking and release the yoke when the bank angle reaches 20 degrees. The 737 will start to level the wings (often to about a 5 degree bank), but then it will return to the 20 degree bank and hold it until change it (be that levelling off, or changing the bank angle).

2. The pitch is pretty good, but it's a bit hard to push the yoke forward and get the angle of attack I am trying to achieve for a descent. Pulling the yoke back for the angle of attack for a climb works fine for me.

So generally speaking, I find CWS pretty good once you understand (master?) it's idiosyncrasies. :-/

I do not use any mods at all with my 737. I did beta test Paul's V-One gauge and his fix for the loss of battery power - the problem where battery power drains and prevents you being able to start AP or engines, and ground/external power (EP) doesn't help either, so you are stuck in a "dead" aircraft. Mind you, the battery power drain problem doesn't happen very much for me, and when I do have the problem again, I simply *uninstall/reinstall it and it works properly again. So I have an "easy" fix for the problem. :)

* NOT the full uninstall/reinstall as in KB #685. It's just a simple uninstall/reinstall. ;)