I like that it's easy to install apps with multiple languages available at once (also very cheap).
It also has an inbuilt translation system so you don't have too worry about any language barrier between your user base/customers! The UI could be better but this can probably be improved by adding more features over time as well if needed - which they will do eventually right? There are other competitors out there who offer similar services however DYIPP does them all much cheaper than their competition!! We use DOYP primarily through our website where we provide translations of English content into Chinese & Japanese versions allowing users from these countries access without having download issues etc.- This allows us great flexibility when providing service outside China e.g Australia / Singapore via VPNs.