Being on the spectrum usually comes with some comorbidities, I agree with starkid, it helps to know what you are actually dealing with. I got my aspie diagnosis in my 20's, in my 30's and 40's I was getting treatment for adhd which seemed to come and go for years. Only recently, after taking a few personality inventories, did I find out that the adhd symptoms were from chronic depression as a result of schizophrenia and bpd. Treating those has made a huge difference in my quality of life, and as a result, makes it easier to deal with being on the spectrum. As far as I'm concerned you can never know too much about yourself, and it's awful hard to know what course of treatment is warranted, or if you need treatment at all, without some thorough testing.
I'm not saying that everyone needs to go that route, but if you can afford to do it, it certainly can't hurt to have the information