Generally the ppl who need 10k+ RPM drivers are:
1. People building file/web servers with out RAID
2. People who need fast read/write with out RAID. (ie. When doing work with 2+ 100MB images in Photoshop)
3. People who want THE fastest HDDs possible (no SDDs accounted here) with RAID.
As good as some of the initial tests showed them to be, apparently there was a Firmware defect effecting part of the outter platters that limited the test results in the ES Samples.
I haven't heard about this yet, mind linking?