This S.A. is a major time saver. Rings my PA mics right, the first time, every time, in next to no time.
Visually ID problem frequencies and kill feedback very quickly and efficiently. No more guessing, no need for a complex/esoteric digital EQ/speaker management units riddled with firmware bugs and noisy circuitry.
I do have digital stage gear, used mostly for bigger events and recording jobs, but for smaller gigs, I love, and still use, old school rack of analog gear. This SA adds the ability to ring out mics just as easily as one does on digital gear, without the mouse and keyboard BS killing my workflow.
I whole heartedly recommend this device to everyone using an all analog setup. No more embarrassing mic ringing miscalculations and ensuing feedback disasters.