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I run these in my gaming rig and I have to say I'm very happy with them. I have had my set for about a year now and for most of that time they have been running with a mild over-clock. I believe these modules are comparable to most of the other premium PC8500 ram set, such as Corsair's Dominator's. The blue heat spreaders are not a jazzy as some other but look nice.
Most motherboards supply a standard 1.8v to your memory modules. These need to run at 2.0v / 2.1v with the standard timings of 5-5-5-15 (1066 Mhz). You will therefore need to manually set the voltage and timings to 2.1v in the bios. Not a difficult task to be honest. They over-clock nicely and I have run mine at 1200 Mhz 5-5-5-18 without any issues.
In my opinion G.Skill are a good product. If you are looking to add a little more memory in your PC you will not be disappointed with these bad boys.