[EVO 4G Q&A, Help & Troubleshooting] drmacinyasha:
[ROM][WTF][BBQ] CyanogenMod-6 - No Sense at ALL! - V6.0.0 (08/28/2010)

[INFO] Unofficial Cyanogen Mod 6.1 Nightly Thead/FAQ (Updated 9/23)

Basically, it's a fully open-source ROM that strictly adheres to the AOSP (believe it or not, while Android is FOSS, or Free Open Source Software, Sense is not, making it non open-source ROM. It's kinda like a moral high-ground, if you will).

100% of the CyanogenMod source code can be viewed on their Github

If you have a feature request, odds are it can and will be implemented in the next version (or if you're more daring, in the Nightly. See below)

If you have a bug report, you can issue it directly to the CM team on their issue tracker. Most bugs are fixed by the next version (and are progressively tested in the Nightly)

Features many speed, battery life, and UI tweaks not found in Sense ROMs, making it also very flexible, especially for skinning.

Has such features as the ability to force roaming-only mode (good for those who don't live in a city with good Sprint coverage, or work in such a location), no carrier-specific bloatware, and many other heavily requested items (for example, the next release will be featuring camera features that outshine even Sense's camera, such as continuous auto-focus, manual focus area, autofocus, and all of this even while recording video).

Has developers and a large community you can get help from, via forums, Twitter, or IRC.

Is recompiled from source every night, so the latest features, bugfixes, and improvements can be tested and tried by users, allowing for a better full release version.

Listed in ROM Manager, meaning that it's extremely easy for people to pull down release candidates, full versions, nightlies, etc.

Some other tweaks/features:

Has the Bluetooth bitpool setting fixed, so audio on BT headphones/headsets sounds superb.

Has the Stagefright AAC fix so AAC streams (Pandora before v1.4, Slacker, XiiaLive, etc.) don't sound like 32kbps MP3's.

Allows for 0, 90, 180, and 270 degree viewing, and you can turn off certain angles via the settings.

Nightlies are currently running a .34 kernel (faster, better battery life, etc.) and hopefully will have .35 or later in time for the official release of CM6.1 or 6.2.

Has a better Bluetooth stack which allows for the use of Wiimotes as gaming controllers, Bluetooth keyboards and mice, and other devices.

FPS unlocked

Both cameras take pictures and record videos.

kernel speed tweaks

Custom version of ADW launcher

Expanded Spare Parts app

DSP settings

Torch flashlight uses camera flash, includes widget

Additional settings and tweaks for Contacts, Dialer, and MMS (maybe more)

There's really a ton of features and things to find in there (like for example, they just added a feature where you can hold down the Back button to force-close the topmost application in case it locks up). You can see new updates as they're created by following the CMSrc bot on Twitter which posts all of the updates as they happen from Github.

And you know what, if you don't like it, fine, that's your opinion. You can always go back to stock, or whatever you want. No pressure. :D

EDIT: And let me say one more thing: On Stock, I got about 4 hours of battery life at work (-110dB signal, 20-60% Time without Signal). I get about 6-10 hours on CyanogenMod with the Snap 7.6 kernel, same exact environment, with more usage.