Pros: Stable ram/ easy to oveclock/ nice heat spreaders
They are seriously stable ram modules they run flawless you cant ask for a better set.
Being corsair you can rely on the fact of if you should ever have a problem with them or what ever corsair will rma them super quick time you cant go wrong with a set.
They can be found for a good price in on-line stores and a few kits can be had on eBay for a good price but bare in mind it might no come with a warranty if used and tbh you only tend to save £2-5 used so get them new fresh.
Not much more I can say other buy buy buy