Thermaltake's Aquabay M6 is a useful addition to any water-cooling loop. It definitely is more than your average reservoir with features that can monitor water level and temperature. This will come in handy in many situations, for example it can alert you of leaks in your system.
I am glad that Thermaltake has made their M6 reservoir compatible with various types of water cooling, not only from Thermaltake. Unfortunately, support for the very popular community of people using 1/2" tubing has been overlooked.
The drive bay LCD with built-in temperature probe is a nice accessory. Where other companies just give you a reservoir, Thermaltake supplies some extra basic monitoring. Overall, the whole kit has a good fit and finish, the reservoir is made out of sturdy plastic and the barbs supplied don't leak.
The Aquabay is a great purchase for anyone that already has a Thermaltake Bigwater kit, as installation is hassle-free, and everything works like it is intended to.