Bards actually have the lowest spell/day (and therefore are the "best" candidates for this class) and as another thread illustrated, bards dont always know what to pick for their feats. I rated it average since I find it pretty useful for a bard and mediocore for a wizard, but downright bad for a sorceror.
Although I agree the slot should migrate to always be 1 level lower than your highest level slot (therefore it is not any more or less useful based on when you take it).
Technik
Although I agree the slot should migrate to always be 1 level lower than your highest level slot (therefore it is not any more or less useful based on when you take it).
Technik