The Behringer TD-3-MO-SR is a fantastic implementation of the classic acid bassline synth with some great enhancements. The added modifications give it more versatility and a much wider sonic range compared to the standard TD-3. The build quality is solid, and the sound is rich, squelchy, and aggressive—exactly what you'd expect from a proper 303-style synth.
That said, the programming workflow can be quite complex. Achieving interesting sequences requires patience, as the step-based programming isn't the most intuitive, especially for those unfamiliar with the original 303 workflow. While it stays true to the classic approach, it might take some time to master.
Overall, if you're willing to invest the time to learn its quirks, the TD-3-MO-SR is an excellent addition to any setup, delivering authentic acid tones with a modern twist.