I had a Sonic/sonic defender when the set first came out. The sonic bubbles got the cosmetic makeover and there were no more complaints about headaches. Everybody loved the orange buffs. I thought the sonic set was very effective. It was more active than forcefields. The mezz protection was nice. The #1 ability was the sonic tu-tu, sonic disruption. The abilities stacked with all the defender buffs and debuffs. Liquefy was tier 9, it was optional, but it was better than the forumites reported.
Ah, the hula hoop of doom. Loved that move on the tank/main scrapper. That power alone made things die so much faster it was like easy street. Since Sonic got the Res Debuffs, I wished they would have given Force Fields a -Def move or two. I really didn't like that our Force Bubble was like Storms Hurricane but without the ToHit Debuff. FF really got shafted compared to other secondaries for Trollers. Still was a much loved set for me though (always liked a Telekinetic-like toon so Grav/FF Troller and later a FF/Energy Blast Defender were a couple of my solo toons).
Personally, I wish the "cage" that Sonic and FF had was more of a single target Hold (make it a good Mag strength too). The effect would be an energy ring around the target while it was active. As someone mentioned above, the "cage" was a great griefing tool for those of us that wanted to slow down the killing. If the devs insisted on keeping the cage move, I would ask that the effect not last so long, maybe half of its current duration, maybe even less. I mean, most of us didn't need a lot of time to clean house in a normal size room, but it was nicer to do it knowing that the boss/LT was not also going to gank us immediately, with the help of his minions. Removing that one hard hitting enemy really increases a team's survivability dramatically, especially with no healer on the team.
Can't tell you the number of times I shouted "Level 50 troller" or "defender" for teaming, getting a team invite only to have the team say "Oh, we need a healer". Try as I might to point out that I was better than a healer because I can get most of the team to soft capped defenses (only hit on average 10% of the time IIRC), they rarely kept me when a healer announced they would help.