I think that OOO handled this promo very well. The costumes look great and aren't out of place (like a giant cartoony sonic head or something), the game bundle is very affordable, the CE bundle comes unbound, and you can buy it from boost (again unbound) without spending a single cent of real-world cash if you happen to be CE rich.
My only sadness is that the sonic costume doesn't grand a movement speed bonus. ;_;
That.
Especially the last bit. I cannae help but feel too slow whenever I move now, just knowing that I have a sonic hat on D:
But yeah, am pleased actually that they decided to keep the set looking very stylised towards SK; they never sacrificed their art teams style and game appearance to have a ridiculous stand-out costume, they really made a good effort to keep it fitting in very well, including the description.
EDIT:
Just to follow on!
My new Sonic setup:
http://i203.photobucket.com/albums/aa4/Darkbrady/Spiral%20Knights/SonicH...
Not found a use for my tails yet; will save them for later!
This saved me the hassle of getting a Regal Wolver Tail
I get 2 tails for the price of one!
Thanks OOO/SEGA/Steam/"insert extra company here"!