I just happened across this topic the other day and not having seen this here, thought I would mention it to those who are also using SSD drives in their systems.
Samsung has built into their latest (4.1) ‘magician’ tool, an easy way to do over-provisioning of your SSD. By simply reserving space for its’ controller (around 10%), the SSD will supposedly have improved performance and a longer life-span.
Some devices may already have this built it, but my Samsung drives did not (840 & 830 series)… so, if you have the extra space on yours… it may be a benefit to look into this.