RAID 0 gives you a performance benefit nothing more. With a typical cheap desktop controller and typical data r/w scenario, I'd question if your controller and processor was fast enough to outperform a decent HDD anyway. Ultimately the limiting factor will be the ingest speed of the CPU. I sell machines with storage cells that can push 60Gbit p/s to the compute nodes, but even with 44 cores, they can't ingest at that rate.
The key in all computer systems design is to have no single point of failure. It doesn't matter if you use flash, disk or even tape, as long as you have multiple copies on multiple drives ideally in multiple places you will not suffer from the failure.
SSD fail due to intensive write activities. Without getting geeky they basically trip over themselves and write stuff in the wrong place or wrong order.