My desktop still old school as don't do anything too intensive on it, will go to SSD when it's time to buy a new one though down the road. My server is SSD though as a shitload of database queries to it.
SSD= faster boot, faster read/write, quieter, more durable to temp extremes/dropping since no mechanical parts, fragmentation doesn't matter as well as SSD can pull data from any location quick, etc...
