Over the years I've tested a couple of different laptops with several different notebook cooler devices, and one thing seems to hold true. That is, whether or not the cooler actually helps to cool internal system components, as opposed to just keeping the bottom of the case cool, depends highly on the design of the laptop. Not only the path of the airflow and where vents are placed in the laptop case, but also how efficient the stock cooling system is and how much heat the components produce. So which make and model laptop you're using is going to greatly affect how effective any cooler you choose will be.
Unfortunately for me, the Thermaltake Massive23 CS doesn't do much other than look good. But the same might be said for any laptop cooler. Being made of aluminum helps keep the weight down, and careful attention has been paid to the edges so that they're not sharp and catch on clothing or other fabric. On a tabletop it does make for a nice base, the rubber anti-slip feet keep it stable and the slope of the base tilts the keys towards you at a slight angle. The Massive23 CS isn't uncomfortable to use on your lap either, although it's a bit big and bulky to balance, and airflow to the fan could be restricted by your clothes. The same goes if using it on any other irregular surface or even on the carpet.
The changing LED lights are a bit of a gimmick, once you set anything on top of the cooler you'll likely never see them except on a desk or table in a dark room or at night by what little light comes out the bottom. Using it on your lap or carpeted floor not only blocks the airflow but also the light as well. Turning off the lights altogether does save a tiny bit of power usage, but the laptop's battery life will still likely take at least a 15% hit from using the fan. Of course, if you're using the Massive23 CS on a desk or table, you've likely got the laptop plugged into AC, and battery life doesn't mean much at that point.
The Thermaltake Massive23 CS retails for $60, which seems a lot to spend on a laptop cooler. Especially if you've got a notebook that doesn't get much cooling benefit from air blowing over the bottom of the case. But if you have a big, high heat producing gaming laptop that you take around to LAN parties, then the Massive23 CS will likely not only help keep your system cooler, but also offer extra wow factor from its good looks and selectable light show.