How long did the effects of Ulthera actually last?

I am looking into Ulthera lifting because of loss of facial elasticity.
Since it isn't a cheap procedure, I'm most curious about how long the results will last.
For those who have actually received it, how long did the effects last?
I would also like to know when the effect first appeared.
I'm also curious if the effect naturally diminishes over time.
For those who have received Ulthera, please share your honest reviews.