However, the developers apparently wanted to give them high level spells still, since many spells which would normally be levels 7-9 get squashed into the upper levels of the spell list, and some lower level spells get bumped down the make the list less topheavy. Summoners only get spells of up to level six (theoretically compensating for having control of a big scary monster). For bonus points, the mere existence of the Summoner's spell list also messes up magic item prices. * The Synthesist tends to attract more complaints because it's easy to see that it's numerically better than other classes the normal Summoner's power is slightly more difficult to compare with other classes. Synthesists can only do one of these two powerful options on each turn. Non-Synthesist Summoners get to summon a similarly powerful monster (which, if carefully optimised, can in itself be better at combat than the mundane party members), and on each turn the character can both cast a spell and have the monster attack. However, the Synthesist archetype is frequently placed lower than the base Summoner class in tier lists. Synthesist Eidolons appear merged with their Summoner, combining their stats. Basically, it allowed the player to max out their character's mental stats, then make an Eidolon with maxed-out physical stats. The Synthesist Summoner archetype breaks the game so thoroughly that it's officially banned from organized play.A rogue flanking a caster will make casting especially difficult, and Fighters actually have a lot of options that make in a nightmare to try to cast against them within 30 feet.

while this means that you don't have to spend precious skill to do it, it also means that there's no way to nullify it, or set up enough skill buffs that you'll automatically succeed. Concentration checks to cast while taking damage is no longer a skill in Pathfinder.

Or give them the stealth/dexterity to act first.

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