Speaking from experience, I have always faced heightism since the age of 5 from relatives, peers, school teachers, strangers. I have been called all the names associated with being short. Now that I'm 7-7.5cm taller, I am extremely pleased with the successful outcome.
I strongly believe that people who are objectively short will most likely be happy with successful LL outcome because they are doing LL to escape the daily discrimination. As for Leechlet, even though he was objectively short, I think he jumped straight into LL (I think it was due to a recent rejection) without fully understanding the entire process and also not having the proper mindset for the tedious and strenuous procedure. He simply wasn't ready for LL.
Average and taller people with severe height neurosis would also be ideal candidates because they would reach 6ft+ with one or two procedures and we all know the social benefits of being that height. But personally, if I was 175+cm I would never consider LL because I don't think it's really worth the risk, health, time and money at that height. I would invest my resources elsewhere.
Anyways, the best candidates for this procedure are physically and mentally healthy individuals who face daily external discrimination due to their height and/or have very severe height neurosis that prevent them from living a normal life. They must also understand whether height is truly the issue in their daily life because LL will not completely change them into a new person but only build self confidence.
Finally, people who do LL for others, expect LL to be a walk in the park, not aware of the short/long term consequences and risks, impatient, not have funds for possible contingencies, have insufficient time and/or have unrealistic post LL expectations would not be ideal candidates. These are the ones who are most likely to regret LL!