Not perfect by all means but the decision to go with lossless audio (probably the reason older phones might have problem) is a good one.
My biggest gripe is how long it usually takes to DL tunes. Its probably has more to do with my connection- I get better DL off my LTE than my home wifi (a 150mpbs connection).
MikeMansor about Ninja Jamm - DJ and Remix App, v1.0.1