I've been looking into this myself. They can sculpt a very feminine hairline - moreso than with scalp advancement - but then it takes however long to grow the hair out. 2-3 years?
It's not nearly as invasive, but will still cost $5-10k depending on how much you have done.
It's an outpatient procedure under local anesthetic, and recovery time is just a few days.
Honestly, I'm surprised that more MTF's don't use this option, but I wonder if it's because of the long hair regrowth time.