I'm a little nervous about spontaneous chaining coming at 1st level. For a one-level dip, a wizard can get a huge boost in flexibility with no lost power and only invests in three metamagic feats that he probably wanted to take anyhow. That is maybe too good for a one-level dip. OTOH the 2nd level ability is really good too, so moving spontaneous chaining back there might just tempt players to take 2 levels and run. Dunno.