Yes.It may sound odd and funny but that's exactly is my personal opinion.
Pre RC1 takes less time to instal than the RC1 build.Almost a 5 minutes difference on same hardware machine.
Pre RC 1 boots faster.
Pre RC 1 build takes lesser time to access various applications than RC 1.
Pre RC 1 is more stable.
As far as nforce drivers are concerned still RC 1 is not friendly with them.
The latest released driver for RC1 by Nvidia makes the system crash prone.
Vista Media Center guide takes a considerable time to download the latest guide on same internet speed which I used for Pre RC1 guide downloading.
Apart from a few diffrences in RC1,still I shall say Pre-RC1 is better.
[this was first published in www.merawindows.com ]