I use xorg on 2 different machines both are intel P2s one a 450mhz w/GeForce MX400 (new), the other 333mhz w/Cirrus logic Laguna GL5465 ob, each have a IBM E74 monitor. I use the Nvidia driver from Nvidia for the G and the Xorg driver for the CL. Both displays are crisper than when I was using Xfree. Though I am not happy with the Nvidia as it will not give me all modes available even when listed in the xorg.conf. The older Cirrus was not even usable with Xfree listing only 2 screen modes even when 8 where configured in. Under Xorg I have 8 screen modes for the Nvidia and 12 for the Cirrus.
Testing other modes xorg is fast on both machines, neither does it require much memory,
If ppl are havin' problems with xorg I tend to lean toward a config issue. There are some minor configure variations in xorg over Xfree and you must do these and REMOVE XFree totally from your system BY HAND after xorg has been installed and updated. Xorg removes much of the XFree wares but does leave some that it does not configure out. That is where human interaction comes in.
Now ppl may fuss "oh another group trying to make wares for the unix community" that is a NO xorg ware are the same wares as XFree with the questionable license wares removed and rewritten.
Source = http://freedesktop.org/XOrg
About the X11R6.7.0 Release
The X.Org repository is based on XFree86 4.4 RC2. Just before its 4.4 release, XFree86 adopted a new license possibly incompatible with the GPL. For this reason, we have recreated its tree as closely as possible without importing files affected by the new license. The monolithic tree is being referred to as simply "XOrg".
X11R6.7.0 contains substantial updates beyond XFree86 4.4RC2, as mentioned in the X11R6.7.0 release notes, including updated versions of Render, Xft, and fontconfig, and a greatly improved Cygwin/X port.
So you basicly have the same stuff!!!