I had been running in Rykas, very light, very comfortable.
I just went for my first "professional" fitting Friday. I apparently pronate and they put me in Brooks Adrenaline (after trying on several). The first thing I noticed was that it was slightly heavier than my old ones, but when I ran yesterday, I noticed I surely didn't fatigue as quickly and had no aches and pains afterward. I'm interested in hearing what others have to say.
And now that you don't have to be perfect, you can be good.