Richard,
In response to your comments -

I use
Mac Pros - 2x 500G SATA raided (WD5000YS)
G5 - single SCSI (not raided) (Cheetah 10K.7 147GB ULTRA 320)

These configuration seem to work fine for the majority of the work encountered

re 'performs better' comment
this was based on Hughs testing results between various SCSI drives both 10K & 15K.
I agree - there are a lot of factors to be considered - of what was available in the price range and size, the recommendation after tests was the drive quoted.

Nevs Fujitsu MAX3147NP was not compared

It was not a comparrison between SSD and SATA