I'd like to share some questions that may be helpful to those going down this road:

How will the diagnosis change your life?
- consider access to medication to make you "normal", how a label will help others around you understand you, how a label will help you grow as a person.

What are the positives of a diagnosis?
- think support groups, job opportunities, a way of understanding yourself and how to adapt your behaviours when appropriate. And also a cast-iron excuse for the odd weirdness that does show that the "normals" dislike. Some people will find it easier to accept you when you come with a label.

What are the negatives of a diagnosis?
- think about the stigma of your "disease", both in that you are officially weird and also that people will expect stereotyped behaviour of the condition (eg "you're not as bright as Sheldon Cooper so you can't be like him"). Think how this will affect you socially (friends may not wish to be friends with an official weirdo) and financially (job prospects). Will the label make you sit back and say "I have a problem with being social" and not overcome that barrier? ASD (including Asperger's) has been used as an excuse to take children away from parents before in the UK, which for me is a negative. What if forcible medication came in to make you "normal"? I've been on brain-changing meds and I hated being "normal" and not being me: admittedly the meds were for another problem, and I never reported that side effect (nor have I sought a formal diagnosis) as I don't want to be forcibly normalised at a future date.

Is an informal diagnosis better for you?
- you may be able to understand yourself better and adjust yourself without people being on at you all the time because of your label and their expectations. You can read various books to help you cope with the "normal" world and no-one else need be any the wiser, save for those you wish to tell. (As an aside, many people I tell now are surprised as I can cover up pretty well, but when you know it is clear when I'm struggling and allowances can be made.)

How will the diagnosis affect those closest to you?
- will they struggle with the diagnosis, will they not want to know, do they prefer you being the "kooky chum" and don't want to know that it's an official "problem"? Will they embrace the diagnosis and help you grow as a person? Will they embrace the diagnosis then unintentionally trap you in a small box with it?