my issue with the Alchemist is that it's a video game class. The point of 3e and earlier D&D, in my mind, is that characters can use equipment that has quantifiable properties, and can prepare things ahead of time.
The Alchemist, on the other hand, is assumed to have all the components for the explosives on hand. They are expected to cost no more than a wizard's components. In fact, the Alchemist is a build designed for buffs; sort of like a Druid or a Cleric, and I'm thinking they're great for close combat as well as short range artillery.
That's great, mathematically, but it doesn't make sense within the game for a limitless supply of potions. Alchemists should have rules for losing access to their concoctions: being disarmed. There should be a penalty associated with carrying around so many individual jars of glass: stealth.
Another point is that there should be vials for individual concoctions that can be stolen or destroyed individually.
As it stands, it's assumed they have everything on them at all times. It just doesn't click for me.
Ditto the Summoner using Charisma. I think they should be Int instead, as intelligent casters. Granted, there's something to be said for little kids with
giant imaginary friends, but if they're "Summoners" they shouldn't be so... likeable. A high Cha should equate to likeability, or personality. Great. So why are they summoning horrors from the beyond?
It's a bit cartoony. Good for particular builds, but I think I'd want an option for a non-Cha build: an Int based build, possibly requiring preparation rather than spontaneous casting; wizards with a glass ceiling on their spellcasting, but a giant eidolon buddy; and a wizardly amount of spells to choose from as a result (ie: as many added to the book as the summoner can find)