What about Crucial? There is always a chance that any of these brands would have a flacks stick. Over the years I have tried G.Skill, Corsair, OCZ, Patriot, Crucial, Kingmax, GeiL. I find that only 2 things matter: the actual memory powering the stick and actual user's overclocking results.
Yeah, there is a huge range with memory and overclocking. There are brands and models only rated for something like 1600 mhz but will easily OC to 2400 mhz and there are those rated for 2133 mhz but won't overclock at all. Then there is the individual variance within each model.