Pretty good  and worth downloading. Considering so few have managed to develop decent Nintendo DS series emulators - on smartphones/tablets OR computers - this is actually a pretty good effort! The interface is great and whilst there is a little bit of sluggishness  the most recent update ensures that most games are playable  even with the sound on (which doesn't seem to affect the performance too much). All that's needed is a little more tweaking for smoother gameplay and this would be perfect... I used Pok?mon Black for my testing.
February 12 2016