It has also caused me to be less risk adverse and take career moves that have really helped me over the years. I haven't been afraid to try new things, to gain new experiences, etc.
But those upsides all had their downsides. The same impulsivity that let me drop everything and move to NYC for bigger and better things is the same impulsivity that saddled me with an embarrassing number of speeding tickets and car accidents, substance abuse issues (alcohol), etc. The same intensity that is a large part of my charm is also a large part of the reason many of my relationships become strained.
Being diagnosed and getting a handle on it has curbed the negative side effects greatly while still allowing the positives to shine through.