The glottoplasty is the type of procedure that took this forum by storm when it first came about ~5 years ago, with everyone raving about how Dr. Kim at Yeson had finally managed to create the impossible - a really beautiful, natural-sounding female voice. The fact that it's a minimally-invasive procedure and relatively affordable were icing on the cake.
There are now several surgeons who perform it, each with their own technical approach and aesthetic ideals. Some of them push quite hard on the marketing front and try to highlight maximum pitch gain, while others are more focused on patient privacy, a natural-sounding pitch range, and do very little to market their services.
I'm really not convinced any one glottoplasty approach is superior to any others, I think they can all produce excellent and poor results, but that statistically the odds are heavily in your favor. The one approach I'm particularly interested in is this new glottoplasty being done by a lady in Toronto - she uses Radiesse to hold the vocal folds together during healing, which supposedly gives more strength and precision than sutures. I already had my glottoplasty in Rochester and am very happy with the results, but I'll be closely watching this new Radiesse procedure: if it pans out well, her work could be the next giant leap forward in the evolution of feminization glottoplasty!
Which, by the way, I consider this "new wave" of feminization glottoplasty to be a real godsend. My first instinct upon discovering it ~4 years ago was SIGN ME UP!!! It's such a relief to speak a few words each morning and think, "This sounds like me!"