While you can get a more accurate part with SLA, there is a limitation in "shelf life" due to UV/light exposure.
FD parts, while not quite as accurate as SLA, utilize ABS or PLA resins which tend to do better over time. I've been exploring ways to finish the part after building to make a smoother surface and enhance the strength.
Form Labs look like a pretty good printer, but it appears as if they have some litigation issues pending: http://www.makepartsfast.com/2012/11/4646/war-of-the-persona...
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