I'm done responding to this "review" after this.
I am into diamond sabers. I am not an expert on everything offered by the other guys. Mainly because I don't care.
If you don't know what a diamond saber does I recommend reading up on it. There is lots of info on the ultrasabers website.
Basically though, light and sound are both completely customizable with the ability to synchronize them. You can have your saber transition through every color in the rainbow while it plays your favorite song as the hum sound. If that's what you want. The possibilities are only limited by your imagination.
Also you get stab, spin, force, and 5 programmable gestures. So the saber reacts to whatever movement you program as the gestures. I'm probably forgetting a feature or 2. Diamond sabers are loads of fun.
That's the thing... I can do all that with neopixel and smoothswing in one saber for less than a third of the price than US charge. On a board that is considered 'budget' by the saber community.
Spending the amount you do on here, I would expect the board to be as customisable as a proffie board, where you could have the saber and blade do almost anything you could dream of.
Want the saber to only ignite a third of the way of the blade with a swing, then each swing after will fill up the blade another portion until full? A Proffie can do that.
Want it to pulse only when swung?
Want to create your own boot effect that will flicker at the emitter before igniting all the way?
Want the blade only lit when still, and stay dark when swung?
Want the white leds in the blade to dance to mimic force lightning?
Want it to light from the top down to the emitter?
Want the lights in the led to dance to a soundtrack like a frigging sound wave?
Proffie can do all that. For the same price as the emerald.
Again, my point is only that US charge way too much for a board that has software that the majority of the saber community now consider obsolete!