No matter what someone tells you or anything that you see in an ad, do not defrag SSD's. There is an option in Windows 8 to optimize the SSD, however it's running a TRIM pass, not defrag. It's OK to let that run weekly, as TRIM is what's needed to keep SSD's in top condition. GC also plays a part, this is done during idle time.
Both Samsung & Intel SSD's has most everything needed to maintain their SSD's, with Crucial you're limited to forum support, but there's some knowledgeable folks there.
Have been running SSD's since 2011 (Crucial M4, Intel 330 & Samsung 840 EVO) & yet to have one fail. BTW, that 128GB Samsung 840 EVO rocks for it's cost ($85) & size. WEI score of 7.9, the fastest component in my PC. The slowest is my GPU, at 7.5 (both sets). CPU & RAM is 7.7.
I plan on grabbing another Samsung 840 EVO soon, a 240GB model, that will allow me to have all SSD's in my PC. Not only will it run cooler, it'll have more power.
System Specs of my main rig, Dell XPS 8700 customized a bit:
http://speccy.piriform.com/results/FguAXKRa64XdBgDSnifH4Bt
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