It may not be as impressive or as affordable as the Black Vortex model but the ICYCube Quad-Bay 2.5"/3.5" drive enclosure again by ICY DOCK is certainly worth checking out.
ICY Dock ICYCube MB561U3S-4SB 4-bay USB 3.0 Enclosure
Icy Dock ICYCube MB561U3S-4S R1 4-Bay external MB561U3S-4S R1
MB561U3S-4SB_R1-Quad Bay 2.5/3.5 SATA HDD/SSD USB 3.0
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MB561U3S-4S_R1-Quad Bay 2.5/3.5 SATA HDD/SSD USB 3.0/eSATA (PM
ICY DOCK ICYCube Quad Bay MB561U3S-4S R1 USB 3.0 External HDD
ICY DOCK ICYCube 4-Bay Hard Drive / SSD Enclosure Review
ICY DOCK – We Look at a Potpourri of Storage Solutions – Techgage
Videos-ICY DOCK
Icy Cube 4 HDD Bay USB 3.0 Enclosure
Supports up to 4 x 2.5 SATA/SAS HDD/SSD into a single 5.25 bay Support SATA 6Gbps or SAS 3.0 12Gbps (Single channel) Hot-swappable bays for quick
ICY DOCK 4 Bay 2.5 SAS/SATA HDD & SSD Hot Swap Cage for External 5.25 Bay | ExpressCage MB324SP-B
Icy Dock ICYCube MB561U3S-4S R1 4-Bay external MB561U3S-4SB R1
MB561US-4SB-1_Discontinued Items (USA)_EXTERNAL DRIVE ENCLOSURES