I bought it because it had good cost per gigabyte and good reviews and low count of returns.

Drive is very silent (no distracting sounds), do not occupy too much space on the desk, enclosure has power button.

CrystalDIskMark
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Speccy:
WD Elements 25A3 USB Device
Manufacturer Western Digital
Heads 16
Cylinders 607*997
Tracks 155*039*235
Sectors 9*767*471*805
SATA type SATA-III 6.0Gb/s
Device type Fixed
ATA Standard ATA8-ACS
Serial Number S3PB4V49
Firmware Version Number 0001SDM1
LBA Size 48-bit LBA
Power On Count 1485 times
Power On Time 347,0 days
Speed 5400 RPM
Features S.M.A.R.T., APM, NCQ
Max. Transfer Mode SATA III 6.0Gb/s
Used Transfer Mode SATA III 6.0Gb/s
Interface USB (SATA)
Capacity 4657 GB
Real size 5*000*947*302*400 bytes
RAID Type None

CrystalDiskInfo (SMART)
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WDC WD50EZRZ-00GZ5B1 : 5000,9 GB [2/0/0, sa1] - wd

Enclosure : WD Elements 25A3 USB Device (V=1058, P=25A3, sa1) - wd
Model : WDC WD50EZRZ-00GZ5B1
Firmware : 80.00A80
Serial Number : WD-WX11DC6RDZKH
Disk Size : 5000,9 GB (8,4/137,4/5000,9/5000,9)
Buffer Size : Unknown
Queue Depth : 32
# of Sectors : 9767541168
Rotation Rate : 5700 RPM
Interface : USB (Serial ATA)
Major Version : ACS-2
Minor Version : ACS-3 Revision 3b
Transfer Mode : SATA/600 | SATA/600
Power On Hours : 0 hours
Power On Count : 4 count
Temperature : 27 C (80 F)
Health Status : Good
Features : S.M.A.R.T., 48bit LBA, NCQ