I bought this item to replace an existing tray and caddy on my PC.
My backup strategy is to clone the entire C drive to another disk, which I remove from the system between backups. This drive bay makes the whole process as simple as plugging in a memory card! With the advent of Win 7, I have been using the bay to swap system disks between 7 and XP, to compare them (very impressed with Win 7 so far). The bay has made this task as simple as it could be without having to resort to a dual boot configuration, which I didn't want to do.
Construction is adequate for its purpose, as long as reasonable care is taken when inserting and removing the disks (don't slam the door shut!). The life of the bay should only be limited by wear on the SATA contacts, which for most users will be negligible.