Ok I got to see how Sonic was for myself. First off, I can't wait to have this game in my hands on March 9th. After playing this, i'm sticking with Sonic as a main no matter what. I had so much fun playing with Sonic.
Sonic at a glance
First off, he is really fast on the ground. I tested his speed on Final Destination and he got to the other end of the stage in seconds. At this point, he dominates everybody in terms of speed (well, he is the fastest thing alive). This can be a problem if you can't control it though. I personally didn't have much problems controlling Sonic after a match or two but, it is a concern for those who wants to use him.
Sonic can combo very well and can rack up damage fast. Good thing because, his power is on the weaker side of things as far as percentages is concerned. He has decent knockback on some of his moves. Sonic's air speed is decent, not as fast as I initially thought. However, his aerials are pretty good. I can already see his Bair be used by many people to finish off juggles. His Fair hit's mulitiple times and the final hit does have some knockback. His Uair is good for juggles. Everyone should know how his Dair works by now, however I managed to sweetspot the ledge with this. It's really powerful and it can be used as an edgeguard just upb to cancel it's animation so you won't go to far down.
His fsmash does have alot of knockback, although there is some lag before it connects. His Usmash hits multiple times before it sends foes flying. Dsmash hits on both sides. I still didn't find a chainthrow for Sonic yet though.
His B moves are weird at first but you'll get used to them. Despite looks, there are some differences with his spin attacks. His neutral b is his homing attack and it homes in on your enemies. Due to this homing properties, it can be used as an edgeguard or for recovery. My opponents underestimated this and I got some kills with it. Side b is his spin dash, he winds up at first then dashes at them. You can then jump during the attack for a followup with an aerial. His down b is his spin charge, hold down and tap b as fast as you can(just like old times lol). The more you tap b the faster he'll go. You can also change direction while spinning around, don't worry it's easy to control. His upb is his spring which is his recovery move. You can do anything after it except for another b move. It can also be used during ground to aerial combos as well so don't be shy about using the spring to continue your juggles.
An interesting thing popped up in one of my matches. Me and my friend was playing on Corneria and he was using Falco. It was his last stock and we both was on the right side of the stage. I pressured his Falco to the wall with the side b and quickly canceled the jump to Fair so i could quickly land. He shielded it then I did the same thing again and he used his shield again. This time however, I got really close to Falco, used down b and tapped as fast as I could. The minute I let go, his shield broke and was dizzied. After finishing him off, he screamed WTF HOW DID YOU BREAK MY SHIELD LIKE THAT?! Now this requires more testing though before this is even called official, but it's just something to mention.
Overall, Sonic is a very good character. Most likely I'm making another thread going in-depth on Sonic options and moves in the near future. This was just my first impressions on Sonic. I couldn't get any videos on my first playthough but the next time I play Brawl, I will at least have some footage of my skill with Sonic in a match. There is still more testing to be done. Be prepared though if you're gonna use Sonic because he is really not a easy character to master. Your gonna need to master his speed in order to even think about using him.