I'm really excited for the arcanist. The class seems super cool, but if it's not your speed, don't include it in your games. As far as PFS play goes, I'm sure this'll go the way of the Synthesist and gunslinger shenanigans.
I'm personally thrilled at seeing how the "magical hacker" comes into play. In a way, I'm kind of hoping it's super strong because of how it'll fit into my given campaign.
Are arcanists lost casters from an ancient civilization, marking a time when magic in the blood was just as prevalent as magic in tomes? Are they a new phenomenon? How the arcanist fits into your world is kind of your own decision. This class is going to be awesome no matter which side of the table you're on.