For what its worth, we used DiscMakers to master. Our levels were pretty much right before we sent it up so not much difference there. I could hear a little EQ difference but not a lot. Don't know if it was better. It was $490 for 12 songs.
It did give us peace of mind, though next time we'll probably have it mastered locally so somebody can A/B the cuts for me.
Hope this helps,
Martin
E. Christina Herr & Wild Frontier