Hehe, I read that thread at driverheaven too. Probably one of the better defrag threads on the web. I have used perfectdisk before, and was not particularly impressed by it. I think O&O is better than PD because although it is slower for defrags, it does not make my system nearly unusable when it is running like PD does. Best blend of resource usage and performance has been Diskeeper pro, and I have no plans to switch to anything else atleast for the current releases. Diskeeper is used on my office network, and I have a license on my home system too. As mentioned in another thread, the autodefrag feature is its best point...truly 'intelligent' set it and forget it, doesnt affect performance if it runs in the background even when gaming.