Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
I just made an account and played 4 games. My last game I purchase Ashe with IP and laned mid. Started off slow then took off strong mid game. Hit a wall where I was no help for awhile but then started BD and it was a sinch.
I purchased all the above items in that order. When I ran out of room for second IE and PD i sold blood thirster and kept fevor for the attack speed and AOE. Then i sold Dorian's for last item.