The liquid resin is much more expensive than the standard plastic filament used by other 3D printers, but it results in prints that are very precise. It can print incredibly small details with layers as small as 25 microns. Also keep in mind that printing on the Form is a longer and more involved process than using the other 3D printers.
The Formlabs site shows some of the unique applications of SLA printing: http://formlabs.com/applications/