Also you can post your queries and feedback on Windows XP Service Pack 3 Feedback Forum on Microsoft TechNet
NOTE: This pre-release software is provided for testing purposes only. Microsoft does not recommend installing this software on primary or mission critical systems. While the SP3 update is available for anyone, Its reminded that it is pre-release software, and is time-limited, and is intended for IT professionals, developers, and other technically-inclined individuals that are comfortable using pre-release software.
I have installed XP SP3 v.3244 on my Home System from Connect which was available since last month, its working fine without any problem. It also gives an option in the Add/remove programs to remove XP SP3 RC.