Summary: Rosewill makes some very good products but I have to say I am completely disappointed with the product.
Pros: The adapter is a great value for what you are getting.
Cons: Be warned this adapter is not compatible with Windows 8.1. The driver CD that comes with the adapter has the driver for the correct model and a folder for Win 8. Installed driver and removed them several times trying to get them to work, all to no avail. The support web site does not offer Win 8 drivers for this model.
Summary: I purchased two of these fans to mount on a cabinet door for ventilation of a PC tower. They do the job, so I can't take off too many eggs, but I currently have them connected with the molex adapter and they are much louder than the replacement fans. Quality is cheaper, but I wasn't expecting top-notch at this price. I may use the 3-pin connection to regulate the speed better, but I really wanted to have them on at 100% whenever the PC is running.
Pros: Moves air well, even with fan filters added in front. Braided black sleeving. Includes adapter for 3-pin fan to molex and eight fan screws.
Cons: At full speed, these fans are loud. There is a noticeable whine. Even with fan filters and mounted inside a cabinet. Red/yellow/black wires show through cheap sleeving. White connectors.
Summary: Been running two of them 24/7 for about two months now without issue. They seem decent quality, and the sleeved cable is nice. I like how the accessories come in thier own box inside the main box. If you don't need them, you can throw the box in with your tool bag so you have an emergency set of fan screws and adapter. So long as I get a year+ out of them running 24/7 in my server in the basement, I will be happy with the purchase.
Pros: Sleved cable comes with 3 pin to molex adapter comes with more than enough screws accessories come in a separate little box. Box is easier to open vs plastic clamshells some fans arrive in.
Summary: I like Rosewill, and this fan works for general needs If it's a specialized fan you are looking for (like one to attach to an aftermarket CPU cooler, or to cool high-RPM hard drives), then I'd recommend stepping up to a high-end fan. For example, if its to attach to a heatsink, then look to a specialized dual ball bearing fan that has high static pressure. But if this is just a general chassis fan for basic scenarios, it's a good buy.
Pros: I always wait at least a year before reviewing stuff on Newegg, and this is no exception. After about 15 months, the fan still works fine. It generates sufficient air for general purpose cooling, and the bearing has not failed... despite being a value-oriented 'sleeve' bearing, and an inexpensive fan overall.
Cons: It could be quieter. Obviously I'm not measuring scientifically, but I am pretty sure it's slightly louder than the 22 dBa quoted, because I have another fan quoted at 26 dBa that seems less audible.