I'm going to offer my thoughts on this new Cyanogen as I now have 24 hours of experience using it and playing with it.
First, and FOREMOST... in my opinion, if you're going to take this rom for a test drive, do something more than just take it around the block. Try it for a morning, a day, a few days... your Droid needs time to fully adjust to this rom.
Second, there is an incredibly AWESOME Black Glass theme for this version of Cyanogen. Here is the link:
928DroidBlackGlass2-2-CM6-RC1-Clear-update.zip
This theme will also turn the status bar black, which is GREAT... but alas... you will have to go into SETTINGS>CYANOGENMOD SETTINGS>USER INTERFACE and change your battery and notifications to WHITE or whatever color you want if you want to see them in the status bar (otherwise your status bar will be solid black).
Even if you're using LauncherPro, you can still pick one of the ultra-cool wallpapers from the ADW Launcher Wallpaper Gallery.
With the Transparent Dialer and Transparent Contacts, awesome Black Glass Theme and wallpapers, this Cyanogen version is the most incredibly AWESOME looking ROM of any rom currently out there, in my opinion of course.
Now for performance... I experienced butter-like smoothness after about half a day. I also turned off all animations because I like to zip, zip, zip in and out of screens and apps.
LauncherPro works extremely well if you give it TIME. It also helps if you turn OFF the 3-D App Drawer (mine was not opening properly) and set the speed to 9 (in my case 10 caused problems). LauncherPro is extremely snappy and robust and STABLE with these settings on my Droid.
A few have asked about kernels... the "Chevyno1, medium voltage, 1.1Ghz" works like a charm for me with any rom I try. Temps never go higher than 110F at the most, and it usually is around 90F - 100F under moderate usage.
I keep my SetCPU governor maxed out on Performance, with the highs and lows set to 1.1Ghz. I have this set up in my SetCPU profiles as well for every senerio except for temps greater than 120 degrees or battery dropping below 8%. My benchmarks in Quadrant are almost ALWAYS above 1400.
There are many GREAT roms out there. But I have found my home now. With all the customization that you can do - not just to this rom, but also to your Droid using this rom - and all the features that this rom provides that no one else does - all this with amazing stability and speed - I will probably stay right where I am until the official CyanogenMod release comes out.
It's 2.2 over 2.2, and I have done some flashing of 2.2 roms over each other, but there is potential for issues. I lost root (e.g., superuser.apk stopped working) when I flashed sapphire over another 2.2 ROM...had to wipe data to fix things. 
