I scored three checks on all levels and no rewards.
I do not believe the normal version of 'Charms' gives any rewards other than Pottermore cards though so I guess it shouldnt be a surprise really.
Pottermore really needs more rewards to thrive. Like, ASAP.
I finished the normal version as well and no rewards. The Library has rewards although it takes a little over a month to get them.
It does take some time to work your way through Pottermore.com to get to the sorting ceremony but if you enjoy Harry Potter its not so bad. It will be interesting to see what house you end up in.