On my "exceptionally handy" list is the NewerTech Voyager Q, an external drive dock for 2.5" or 3.5" SATA drives. In a second or two, you can pop in any 2.5" or 3.5" SATA drive, connecting the Voyager to your Mac via eSATA or Firewire 800 or 400 or USB. In short, it connects to just about anything out there! Sonnet E4P NewerTech Voyager Q Why is this handy? There are many use cases-

Backup - you can slot in a backup drive perform your backup, then remove it and store elsewhere. No hassles with drive trays, screws, etc. This is a great way to use those older slower drivers for backup that you might not otherwise use.

Cloning a system - when switching systems you can quickly slot in a spare drive, clone your system (eg with Carbon Copy Cloner), "wipe and clean" the target drive, then clone the drive in the Voyager back to your system drive. (Two backups are always advised). This makes life so much simpler when changing system configurations, since any old drive will do with no muss and no fuss with tools.

You can use the Voyager Q as a boot drive via Firewire 800, which means that any clone of your system drive can instantly have you up and running if your main system drive fails.

Connectivity - with the 4 interfaces (eSATA, Firewire 800/400, USB), you can connect to just about any system with any laptop or desktop SATA drive.

Negatives
Almost none: one small gripe is the power connector which is a round little metal plug with several contact wires inside (it’s a fairly common type). It just isn't that robust, and never really seats snugly and soundly. Still, this is of little concern unless you’re reaching around or near the unit.

Conclusions
If you ever wanted a quick and easy solution to accessing bare hard drives, this is as easy as it gets, and the price is right. Users looking for a versatile backup system need only this unit and some bare hard drives to make rotating backups. It’s a great way to use last year’s hard drives.