I was impressed to see that none other than Shuji Nakamura of Nichia championed them. When you get Mr. Nakamura (http://en.wikipedia.org/wiki/Shuji_Nakamura) excited about something, you know you're on to something.
One important thing that I didn't see mentioned was if the crystals that they grow can be in any desired plane. Recent papers on the subject, including the ones from Nakamura's UCSB group, only seem to depend on different substrates to obtain the desired characteristics and not this method.
