Should I take Spell Specialization for both Summon Monster V and Summon Monster VI?

[Natural 1s]

Is taking Spell Specialization feat multiple times good idea for wizard specializing on Summon Monster spells?

I have already taken Greater Spell Specialization feat, so I can replace chosen spell every even level.
If I take Spell Specialization feat multiple times, I will replace the lowest level Summon Monster spell with the highest level.

Other summoning feats I have taken so far:

Acadamae Graduate
Spell Focus (conjuration)
Augment Summoning
Superior Summoning
Spell Specialization (Summon Monster V)
Greater Spell Specialization

PS: I had already asked this yesterday, but nobody had responded. So I have changed name of the thread – I hope somebody will advice me.

[Oterisk]

So, how many fights do you have that take longer than 10 rounds? Because that's the only variable in a Summon Monster Spell. It's probably a bad idea. You'd get more mileage out of some Metamagic like Extend.

edit: I'm sorry, your range would also increase by five feet. I really don't think that's worth a feat.

[Natural 1s]

My point of view is how many fights will I have per day.

Because on (for example) at 12th level I will be able to prepare only 3 6th-level spell, which I can choose to change to Summon Monster VI (thanks to Greater Spell Specialization). But I also want to do some battlefield control, not only summoning.

So having other 4 possible Summon Moster V maybe a good idea.

[Dasrak]

Spell Specialization in Summon Monster spells only makes sense at low levels, and by the time you're 12th level it should be retrained if at all possible. Use the preferred spell feat instead of greater spell specialization. Greater Spell Specialization is just a worse version of Preferred Spell with slightly different prerequisites, so it only makes sense if Spell Specialization is important to your build (which it isn't).