Heres some pics of the caddy installed.
This is the back of the caddy showing the power adapter and the connector for the fan/pwr light which is just on the edge of the pic. This connector can be pulled out to stop the fan, it does not stop the drive when pulled out, so running the fan is optional.
The SATA power connector which includes the fan power has a molex at the other end. So if you want to use a SATA power plug from the PSU, you can not have the power to the fan, uless you use a second supply for the fan.
Here the depth of the caddy can be seen. It is quite long ! The caddy is at the top, below is a 120mm fan then two DVD drives. Athe the bottom is 3 HDD drives which have a 120mm fan in front of them. The case is an Antec 900.
Front of the caddy with door open
Inserting the drive
Door closed with drive in
The door lock seems pointless unless you are worried that someone might steal the drive !! Its unlikely that the door will be opened by accident.
Pros
Does exactly what it says
Windows detects drive as any other HDD in the system, no overheads
Easy to use
Cons
Fan is a little noisy, I can hear it above my other fans (although they are 120mm at 1600 rpm)
Unit is all plastic, apart from internals, and feels a bit 'cheap'
Door feels like it would be easy to 'snap off'
Drive is not locked in when in use, so you can pull the drive while it is being accessed and spinning at full speed! Im now using the software recomended by ubern00b (Many Thanks!) which works brilliantly.
Im going to see what effect running the drive without the fan has on temps. Suspect the fan is not a critical component and therfore the caddy without the fan may be a better option.
If you are unsure about the need for a fan, then you can get the one with the fan as you have the option of unplugging it.
Overall highly recommended if you have a few spare SATA drives knocking about that you want to get some use out of.