I haven't (knock on wood, as sooner or later I know I will, and I use a ton of them, between builds and upgrades), but I can shed some light on DOA sticks and/or sticks that get RMA for not running at spec.....and a lot of it starts right here and at other forums....Every day I see threads here and around with people wanting more DRAM and being told 'Yeah, just add another stick....or get another set of the same freq and timings" and DDR3 just isn't like DDR or DDR2 was where it was relatively easy to just mix any sticks....with DDR3 any time you mix sticks from different packages it can and often is problematic (even with the same exact model), which is why there is such a variety of sets out there at different freqs and amounts of DRAM (and they are guaranteed by the set - because the sets have sticks tested to play together, and for those 1600 and up the XMP programming is done by the set, they may appear to be the same, but as an example a 2 stick set may require and advanced tRFC timing of 208 where a 4 stick set requires a tRFC of 278)....another everyday common problem we see is people coming to the forums saying "I have a ABC mobo that can run up to 2400 sticks, I want to run ACME XXX 2400 sticks will it be OK"- and many, many people still living in the past saying - "Sure, if the mobo can run themn then you'll be fine", but with todays systems, it's more the CPU (actually the MC (memory controller in the CPU) that determines what DRAM you can run than it is the mobo (which plays in to a lessor degree), couple good examples people with a AM3+ mobo which is capable of 2133+ DRAM and they have a FX 6300 or 8320 - very few of which can run 2133 at 2133, so people blame the DRAM, or same on Intel, a Z87 mobo capable of 3000 DRAM they go out and buy a 4430 CPU then want to run 16GB of 2400 sticks, where they be lucky to run 16GB of 1866...
I've stayed away from Kingston for a few years now, Corsair I used to use a ton of and still use a fair amount, but they've been my #2 choice for about 4 or so years....they have some good sets, but overall I found that GSkill consistently across their models/lines of sticks have OC headroom for a minimum of a full step up, which indicates they are strong sticks and very strong at spec