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This looks nice, and I might give it a try to transcribe the live Q&A sessions I am doing for the course I teach. My question is how well does it handle accents? My slight French accent often trips the Cortana-powered transcription that is integrated in PowerPoint, but I assume your models are a bit more complex than those.
We offer Global English model for en-US language. All training data with different accents were contained into single model and it should work with different speaker accents (about 90% accuracy). But of course it depends on audio quality. For very noisy speech the accuracy may be lower than expected.