A peltier system can provide over 100,000 hours of reliable service because it has no moving parts. It is much, much smaller than any compressor-based system could ever be. Last, but certainly not least, a peltier device is much cheaper than a compressor solution. A refrigeration device comes in a custom-built case that can be very expensive. With more complication comes the increased risk of failure, as is the case with any mechanical or electrical device.
Beryllium copper is an alloy that contains copper, beryllium, nickel and cobalt.
Because of these properties and the design of the back plate itself, heat is drawn from the CPU more efficiently then ever before. The manner in which the cooling unit is fused to the CPU makes it impossible to get a good reading. STEP does their testing by actually fusing a thermistor device in between the CPU and the copper plate on test units which allows a true measure of temperature. At first glance, STEP's coolers are very expensive compared to other CPU coolers - and there is a good reason for it. Without hesitation I can say that STEP's coolers are, by far, the best engineered, best built CPU coolers on the market today.