Summary: I had two drives drop out on my RAID-5 because they cables must have come loose. It took me hours to get that working again. I would not recommend or use these for mission critical.
Pros: Have 7 seven of these in a media server with all of them filled (RAID 5). I also use one for an offside backup drive I take home with me every day. That means I open and close that drive 364 times a year, and it's been working great for almost 2 years.
Cons: Both the power and SATA connector are easily disconnected if you brush against the cables inside the case. I wished both would snap into place in the back, like they would on a harddrive. I had to use some electrical tape, cut into small strips to make sure they don't come off. It's a hack but it seems to work
Pros: Look good, close securely, have a simple mechanism for drive extraction.
Cons: Intermittently lose connection to/ drop power to the drives. Problem goes away when the backplane connector is bypassed, so I know it is either the backplane or the closing mechanism not properly positioning the drive. Occurs most often when drive is warm, and occurs with multiple drives.
Summary: I broke the first one I owned by removing some other case components - the side connector on these are very flimsy and not well-guarded. This isn't industrial-strength stuff here, but it's cheap and it sorta works....just be very careful when inside the case. I just ordered a replacement because it was useful. Just remember too that it's not true PnP...you'll most likely have to reboot to get the drive to recognize properly.
Pros: Nice spring-loaded ejection mechanism. Beats cracking open the case all the time to swap drives.
Cons: Cheap construction. Silver color is kinda ugly. Very easily broken from the rear when you have little clearance in the case.
Summary: Worth what i spent on it. Some computer cases won't like the mounting design...but it does what it's supposed to do. If i had to do it over, i'd probably spend a bit more to get something that fits better into the bay.
Pros: Does what it is supposed to do. Inexpensive
Cons: Doesn't take up a full 5.25" slot in my machine. stays in place via the screws, it is kind of suspended in the bay. Cheaply made
Pros: Trayless design allows for quick hot swapping of drives without having to buy multiple trays. Comes with all the cables you need to get it set up.
Cons: The door has a tendency to not like to close. There were a few cases where the door would pop open on it's own and thus partially ejecting the drive. I ended up having to lock the door every time I insert a drive to avoid unintentional ejection during use.