I really like the Occultist Archetype. Its powerful, flavorful, adds a little something a regular Arcanist wouldn't be able to do and it doesn't cost you too much stuff. I prefer it over the regular version, really. The only downside is it delays your Exploits which in turn delays access to the Extra Exploit feat.
I do really like Quick Study. The Arcanist has a limited number of prepared spells forcing a choice between utility and combat spells. With Quick Study you don't have to worry about that choice. It just expands your versatility and adaptability a great deal, far beyond leaving slots open ever would.
Consume Magic Items fulfills a similar function, really, provided you have the items and willingness to sacrifice them. I like to get Scribe Scroll to fuel it. It allows you to really use all of your exploits instead of merely relying on your SM SLA.
Instead of the Familiar Exploit you might want to consider the Bloodline Development Exploit choosing the Arcane Bloodline. It also grants a familiar. It won't gain abilities as you level beyond the first, but it'll still gain everything else, and you can still get the Improved Familiar feat. The choice is reasonable because it allows you to use some of the other abilities the bloodline provides if desired, Metamagic Adept specifically, for a mere single point from your reservoir.
Instead of Dimensional Slide you might want to consider School Understanding choosing Conjuration (Teleportation) instead. They offer different kinds of utility, so I often end up with both.
Personally, I rarely take feats to enhance my summoned monsters. I prefer using them for their abilities rather than their physical combat value, allowing me to spend my feats on other stuff, like Extra Exploit. I also think there's already plenty of utility in the regular SM line that I don't feel the need to expand the list with feats either.
Won't using Bloodline Development Exploit (Arcane) limit you to a familiar that is permanently stuck at lv 1?