I have tested these.. I'm most impressed with AIVC (first choice). It has a lot of features, good voice. I bought the pro version. Alpha.. not impressed. Assistant is good, but a lot of ads and paid version is $2/month or $20/year. Vlingo was bought by Nuance and is now Dragon (second choice). Very good, but has no personality. Jeannie is okay, but free version uses Android voice. Maluuba is boring. Robin is good, but more like a gps app. Skyvi (third choice) is fun and has a great voice, but can't open apps or do math.