I just installed the Nimitz optibay. Seeing that it's made of sheetmetal (like the MCE) it is much lighter than the Maxupgrades caddy, and consequently, it has a a little bit of flex to it; just like the Superdive. When I first bought the Maxupgrades, I thought the machined aluminum one would be the better one. I was wrong. The Nimitz one is great. Lightweight, cleanly manufactured. Fits much better than the Max Upgrades, as the Nimitz doesn't need to be "crammed" like the Max Upgrades does. For those worried that it will slow your connection down to SATA I speeds, I can tell you that my negotiated speed is the same as the chipset's link speed. Here ya go. Probably going to order another for when I decide to put an SSD in my old 2008 aluminum macbook. As of now, I'm a happy Nimitz customer.