It's only silicone and nano chips, still open to what ever faults may happen to modern technology. Nothing is perfect. That said, they have no moving parts, so there's less mechanically to go wrong, it also means less heat which also means better battery life and less power consumption.
The only caveat which SSD's present is their write/delete life span. It is said that they can only be written to and have data erased 'x' amount of times before it is no long able to be written to. The general consensus is an average 10 year life span. YMMV depending on the amount of writing/deleting to the memory modules.
Always have a back up HD, no matter what the format type !
Doug