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For the brave

I tried it. Copying stuff was definitely faster but my SATA DVD-RW stopped working with a code 10. I tried a couple of fixes but uninstalling SP1 was the only way to get it back. I'll wait for the final release.
 
List of things from the MS Doc about SP1 RC. I think I'll hold off until the final version.

Installing Windows Vista Service Pack 1
Things to Know Before you Install

Please read the following instructions and cautions prior to installing.

Before you install:
? If you have a prior version of SP1 beta installed, you must uninstall it prior to installing RC.
? Use the Control Panel applet ?Programs and Features? and select ?View installed updates? from the top left of the task pane. Under Windows, look for ?Service Pack for Windows (KB936330).
? Please wait 1 hour after uninstalling a prior build before installing the RC. The installer service needs to clean up and complete the uninstall prior to installing a later build. Failing to do this can result in installation errors for the RC version.
? This is pre-release code and will change before the final release. Windows Vista SP1 Release Candidate is for individuals, organizations, and technical enthusiasts who are comfortable evaluating pre-release software. This pre-release software is provided for testing purposes only. Microsoft does not recommend installing this software on primary or mission critical systems. Microsoft recommends that you have a backup of your data prior to installing any pre-release software.
? Windows Vista SP1 Release Candidate is Time-Limited software. It will no longer operate after June 30, 2008 and should be uninstalled prior to that date. Note: After installation your desktop will show the text ?Evaluation Copy?. This does not mean that your system is no longer ?Genuine?. It means that you have installed a test version of software which is time-limited.
? The ?Evaluation Copy? text will show up on the 2nd boot after installing the service pack. Likewise, the Evaluation Copy text will remain during the first boot after uninstall, but will disappear after the next reboot.
? If you install the Service Pack 1 Release Candidate, it is strongly recommended that you also plan to install the final version of Windows Vista SP1 when it is released in the first quarter of 2008. To do this, you will be required to uninstall this pre-release code.
? Support is through self-help and peer support via the Windows Vista SP1 forum. Assisted support (phone, email and online chat) is not available from Microsoft Support for this RC release of SP1.
? You must have a genuine copy of Windows Vista installed on the computer prior to installing the Windows Vista SP1 update.
 
If you install the Service Pack 1 Release Candidate, it is strongly recommended that you also plan to install the final version of Windows Vista SP1 when it is released in the first quarter of 2008. To do this, you will be required to uninstall this pre-release code.
This is really the most important caveat. There will be no direct upgrade path from the RC to RTM.
 
I just installed it on my Ultimate x64 machine, and it fixes the one major problem I'd had with Vista - the ReadyBoost cache being dumped and re-created from scratch on a resume from sleep (which really dragged down performance as it was rebuilding). No such issues now, the cache is persistent across sleep events.

It will be somewhat of a pain to uninstall/reinstall once the final SP1 is released, but I'll deal with it. 😛
 
It shouldn't be that big of a deal to uninstall the RC SP1 before installing the final code once the calendar rolls over. Waiting an hour afterwards seems to be the worst part, unless I'm missing something. I'm very tempted to install the RC on my gaming box just to put it through its paces but maybe I'll end up waiting for the final code. We'll see.

 
It shouldn't be that big of a deal to uninstall the RC SP1 before installing the final code once the calendar rolls over. Waiting an hour afterwards seems to be the worst part, unless I'm missing something
Yeah it's not a big deal, it just takes awhile even when you wait an hour or so. But I've done it a few times now and I haven't had any issues. My volume is also encrypted with Bitlocker, and it has handled that with no problems.
 
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