I'm not Nufan, but I can answer that...
My Raptor showed up a couple days ago. Actually, I think I'm probably more like the typical user. A lot of people on these boards are RAID obsessed, whereas I on the other hand prefer to shoot for the highest single-drive reliability/performance I can find. My prior drive was a WD400BB, so I don't upgrade drives all too often. I buy a new system every 4 years and do a substantial upgrade every 2 (new video, ram, fastest processor the motherboard will allow).
My system is outfitted for minimal noise. I have an Antec Sonata case, Zalman heat sinks, etc. Anyway, my assessment of the drive is that the idle noise floor is lower than the WD400. The WD400 had near-silent seek noise, whereas the new drive is more audible (very low volume clicking). However, the drive is in my personal workstation which is not a server, etc. Consequentially it only tends to seek when I'm loading an app, etc (<1% of the time).
This is fine for me, but if for instance you were a student who spent all day trading illegal music then yes, the seek noise could get annoying. It's more than anything Seagate, less than anything SCSI. For the typical/performance user it is probably fine, for those 'silent obsessed' the Seagates are still best. My line of thinking is the highest performance possible (all at stock speeds) with the least noise possible.
Oh, and on the bright side, my WinXP boot times are around 15 seconds.