There was some good discussion re: Elec/Sonic in the thread entitled, "Is /Sonic that bad??" located at http://boards.cityofheroes.com/showthread.php?t=239937 The overall summary seemed to be 'boring but effective' and 'difficult to IO out'.
Hope this helps!
My EC/Sonic is only 20 thus far.
I've played with a high level EC controller on test, and I've leveled both a /sonic controller and sonic/ defender, so I have some experience.
What the previous poster has said is partially true-- sonic CAN be boring... on a defender. On a controller it frees you up to focus on your primary.
Sonic is a nice fit for EC. The big bubble lessens the chance of having conductive aura shut off by mez; conductive aura forces you to move into melee range providing more protection to your melee buds; your AoE immob ensures you'll be taking only ranged and AoE damage types or which AoE defense can easily slotted into resistance powers via Aegis; your debuff toggle doesn't break your sleep; and so on.
It's really a match made in heaven in my opinion.
Well I was just summing up what the other posters said - but I agree that I *do* get really bored on my sonic defender, who just hit 44. I tend to stare longingly at the vengeance button hoping someone will somehow die so I'll have something flashy to do =)
Today I was on my electric control/electric blast dominator teamed with a good friend's sonic/sonic defender. At first he put the sonic hula hoop on my dominator since I do have 3 melee attacks, but later switched it to the kamikaze gremlins (who by the way really thrive with sonic shields). I noticed an immediate synergy. The gremlins were amazing. Their damage really spiked up and with the shields they weren't nearly as squishy. Has anyone had experience with an electric control/sonic controller? It seems like an unusual thematic fit, but it also would seem to be very effective.
Triumphant Defenders Forever
Psylenz FF/Psi, ArticQuark Storm/Rad, Symon BarSisyphus Bots/psn, Max VanSydow Thugs/Dk, Cyclone Symon Bots/stm, Blue Loki Ice/Cd, Widow 46526
HelinCarnate:OMG it is so terrible. I have the option to take 3 more powers but no additional slots. Boo F'ing hoo.