I recently put one of these into my home server. I bought one because it allows four drives to be packed into 3 x 5.25 in slots, but needless to say it also allows hot swapping drives without opening the case. Of course the "HDD failed" light only works if you have a SATA/RAID card that supports it. Make sure you use the supplied screws to fit the drives to the caddies; if you use others the caddies will not fit into the enclosure properly. Even a tiny difference in screw size is significant.
The enclosure was a tight fit in my case - it took some wiggling to get it in and the lugs in the case drive bay shaved off some of the power coat. On the plus side the fan is pretty quiet.
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