Virtual-Hideout posted a review on the ICY DOCK MB454SPF-B Internal 4-Bay Drive Rack

The construction is high quality, with a very slick operation for removing and installing the sleds. I like the fact that it's 4 Hard drives only taking up 3 optical drives. Simple install, compatible with RAID arrays and no drop in performance are all great features.

ICY DOCK MB454SPF-B Internal 4-Bay Drive Rack Review