If you are searching around for DDR3 triple channel memory (to pair with a socket 1366 motherboard), then you are probably aware of current prices. 6GB of RAM will cost around 65 for decent quality, whereas this product retails for 75, and has the added bonus of being 3x4GB (rather than 6x2GB). So price / GB looks very good. My only concern prior to purchasing this RAM was that I hadn't heard of the manufacturer (Komputerbay) before, but still, 100% more RAM for 15% more money sounds like value to me.
The RAM works flawlessly for me. Unless you are a keen overclocker, its rating of 1333MHz is also more than good enough too. This is because unless you are running the top end Core i7 CPUs (980x, 970 I think), the memory will only run at 1066MHz anyway (natively). So if you plan to overclock one of the slower CPUs in the range (I own a 950, for example), then this RAM should be able to handle modest overclocking. The only other situation where this difference might apply is if your motherboard allows you to adjust the multiplier used to determine the memory speed - for example I can modify my multiplier so that it does run at 1333MHz speeds. This does have the minor consequence of (automatically) adjusting the latency timings, which I've added below. (Basically, while higher latency timings are 'bad', this slight increase is more than offset by ramping the memory up to its full rated speed.)
Just to give you an idea of the RAM's rating, it scores 7.5 in the Windows Experience Index test at 1066MHz, and goes up to 7.8 at 1333Mhz, which is certainly quick indeed. It's not the most rigorous benchmark, but at least anyone with a computer running Vista/7 can get a rough idea of how it compares to their current RAM.
Unless you are a user with data-intensive applications, 12GB is probably far more RAM than is necessary. However, if you are teetering on a decision between 6GB and 12GB and the price above tempts you, then go for it, because as far as I can tell, this is a very good product indeed.
For those interested in the latency timings for this RAM, they are as follows:
<533MHz CAS 7/ tRAS 20/ tRC 27 <- used at 1066MHz speeds
533 - 609MHz CAS 8/ tRAS 22/ tRC 30
609 - 685MHz CAS 9/ tRAS 25/ tRC 34 <- used at 1333MHz speeds
685 - 761MHz CAS 10/ tRAS 28/ tRC 38 <- overclocking territory, also beyond what the RAM is rated to run at. I haven't taken it this high.