It is more helpful though for classes that give a lot of skill points, but are missing some of the crucial rogue skills like daggerspell mage.
Another good use of the feat is with the Human Paragon class. If you know what other class(es) you will be picking up, you can make sure not to have an overlap in choosing skills.
Exemplar makes a good one level dip for Able Learner Builds as well (all skills are class skills!).
On a side note, the real reason I love this feat is cause the Chameleon class requires it and I just love that PrC.