Bought this to replace a Samsung Spinpoint SP1604N, which was chosen for its quietness and was mounted in a Silent Drive enclosure inside the PC, from QuietPC. The Seagate is slimmer than the Samsung, so didn't fit the Silent Drive enclosure, but direct mounting it inside the PC resulted in an even quieter drive than before. So I can recommended this type for anyone looking for a quiet drive.
It doesn't compromise the performance either - the Seagate measured 103 MB/s average read rate, compared to 51 MB/s which I had been getting from the Samsung via PATA using HD Tach 184.108.40.206, and burst rate is 116 MB/s compared to 93 MB/s from the Samsung.
The drive doesn't come with any extras at all, so you may well need to buy a SATA data lead and a SATA power lead if your power supply doesn't already have one, or a splitter/converter. You also need to find four mounting screws. The drive is capable of 1.5 GB/s transfer rate, by adding a jumper, which is not included, so defaults to 3 GB/s but my Asus A7N8X motherboard didn't complain when I attached it without adding a jumper.
I used Acronis True Image to copy over all three of my partitions in one go, which took about 40 minutes (160GB copied and 500GB formatted, all in one go) total, so I can also recommend that software.