As an avid thrower of the OG Bobby Musick medium burst moonshine Sinus, I approached the Opto Sinus with a mix of excitement and skepticism. Could it possibly match the torque resistance, dead-straight putts, and that satisfyingly beefy feel I’ve come to rely on?
Well, the short answer—kind of.
The Opto plastic brings a fresh twist to the Sinus mold, offering a smooth, grippy-yet-durable feel that holds up to tree smacks and pavement skids far better than its softer predecessors. The flight? Still reliably overstable, with that dependable zero-turn and firm fade that makes it a dream for forehand approaches and headwind putts. However, compared to the Bobby Musick edition, it lacks a bit of the “bite” on landing—where my burst moonshine Sinus would check up and sit, the Opto has a touch more skip.
Spin it hard, and it’ll hold a laser-straight line before dumping left (or right for the flickers) with a no-nonsense finish. It laughs in the face of headwinds and excels at those touchy upshots where you need trust, not hope.
Final verdict? The Opto Sinus is a worthy successor, but if you’re a die-hard fan of the OG Bobby Musick run, you might miss that velvety burst feel and slightly softer, more predictable ground play. Still, if you want a Sinus that lasts forever and shrugs off the elements, this one deserves a spot in the bag.

Fun disc with a great feel to it. For those tricky approaches or putts I like that it is so stable.

I loving it