Getting the positive diagnosis of Asperger's has been a roller coaster for me over the past 15 month, but in the main it's been a very positive thing. I've endeavoured to use the positive the traits of my autism to combat the more negative traits, and in the main it's working. I still beat myself up when I do revert to type though, as it's so frustrating.
Knowing that you are different, and why, gives you a good starting point to make sense of your life, and I'd recommend that if you feel you are on the spectrum, and that knowing for certain would make a difference, then go and get a diagnosis. Had it turned out that I wasn't on the spectrum I would have been devastated as it would have meant I had some other condition, and would have to start looking for answers elsewhere.
No longer do I make up ridiculous excuses to get out of social events. I once said I'd fallen off my shed whilst re-felting it and had concussion to get out of a formal meal. Now I just explain to people that the stress of thinking about invites might mean that I don't show, and people are in the main understanding. My work colleagues have gone out of their way to involve me in socials since disclosing to them. My employer has also made changes to help me overcome difficulties I had started to have in the workplace. Your mileage may vary of course.
The only negative comment that I remember getting was from my Wing Commander (I'm an Officer in the RAFVR(T)) who said that my access to weapons would have to be reviewed now that I had Asperger's, because that's what those in America who go on shooting sprees have. I calmly pointed out that I'd always "had" Asperger's in the 29 years I've been using weapons, including the 4 when I was appointed the shooting officer for my wing, and that being a stickler for following rules to the letter probably made me safer around weapons than others. Nothing more has been said on that subject.
I do have down days though. The reason I sought a diagnosis is because my relationship was failing, and I still screw up on that score now, but a lot less frequently. It's really hard on my partner, but she is trying her best. I used to think she was the one with issues, and now that I understand theory of mind, I realise that it must be really hard for her to cope with me, and that upsets me.