Some of the larger complaints of the original design were the lack of room behind the motherboard tray to do much for cable management, lack of room for longer video cards, ease of use and lack of tool-less features and the last drawback to the original was if you wanted to run water cooling, you had to punch your own holes to get the tubing outside of the case. Essentially the original Three Hundred was pretty bare bones as far as a lot of mid towers go.
This time around Antec really listened to the users of the Three Hundred and took the chassis back to the drawing board to see just what they could do inside of the same sized chassis, yet offer everything today's users are demanding of manufacturers in the feature set. With the newest version, the optical bays and hard drive bays have gone to a tool-less solution and the hard drive rack has been spun ninety degrees to eliminate some of the wiring mess inside. The motherboard tray is now offset and offers plenty of room back there and the expansion slots got a redesign to allow for more room inside of the chassis to fit even longer cards now.
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