Conclusion:
If you're looking for a way to either add more hard drives to your system easily or simply cool and silence your current ones more effectively, then the Silverstone CFP51 is the perfect product for you. This is an excellent hard drive mounting solution and unlike all competitors, Silverstone makes sure the fan in this unit is very quiet so overall system noise won't be greatly increased. In this system with the extra fan of the CFP51, I could hardly hear an increase in noise at all.

Pros:
Stylish design (and available in black or silver to match your case)
LED fan not only looks cool but is also very quiet, so very little noise is added to your system
Mounting system helps reduce noise
Plenty of included screws for installation
Great way to add 4 drives into 3 bays!

Cons:
Front bezel sticks out a little bit, this could obstruct some case doors from closing