The following is from the FamilySearch Blog. Read carefully, these products are not authorized to work with LDS Temple data. They can read and/or write to Family Tree but they are not LDS authorized. If you do not need these feature and have a Mac this could be a great option for you.
FamilySearch is pleased to announce the first Tree Share Certified applications for Mac OS X and iOS computers and mobile devices, MacFamilyTree and MobileFamilyTree. Charting Companion for FamilySearch is now Tree Access Certified. “Certified” means the product is compatible with FamilySearch.org and has features that conforms to our strict standards of quality. Full Story