Joe Walsh used a Maestro Echoplex during the recording of "Hotel California," as confirmed by Bill Worrell on reverb.com in the article "The Gear of The Eagles' Guitarists."

Yannis Philippakis of Foals is seen using a Maestro Echoplex in a user-uploaded photo on Hiwatt's website.

On pg. 3 of this interview in Tone Quest Report Vol. 9 #5, published March 2008, Mike Campbell states the following about the Echoplex:

In the early days, there weren’t many pedals that I’d use. I would use the preamp in the Echoplex for my edge if I needed distortion, as the Super Beatles were really clean. I think the secret to my distortion and sustain is the Echoplex driving into the Super Beatle. I occasionally used a wah wah, but most of my sound is that old, noisy tube Echoplex into the Super Beatle.

The Echoplex is also mentioned in this March 1983 Musician article.

Ever loyal to their roots, both Petty and Campbell play through very cool looking Vox Super Beatle amps, jazzed up with Echoplex and MXR Dyna Comp.

In this Instagram shot taken by Sayce himself you can spot the Maestro Echoplex.

The Guitar Geek rig diagram from around 2000 shows that Doyle Bramhall II used a Maestro Echoplex tape delay while performing with Arc Angels.

"I have an old Echoplex and a Roland Space Echo. But onstage I use the Boss RE-20 Space Echo pedal, which has a tap function. I don’t use a distortion pedal. I never have in my life. I use the amp’s natural gain. And I use my guitar’s volume knob as my gain channel. When it’s on 10, that means I’m ripping!"

Daniel Ash states in this interview that he has used the Echoplex.

In a photo shared by catinlap on Flickr, Doug Martsch is seen using a Maestro Echoplex during his solo shows around 2006/2007.

East Bay Ray's Echoplex is one of the key components of the sound. He comments:

If you look there is an Echoplex tape echo and it’s usually sitting on top of the amp. It had a foot pedal—just an on/off switch—which would be out onstage where I would be. As I remember, I found this foot pedal that was die-cast iron. It was very heavy, but it was easy to pull out of the way. Actually, sometimes somebody landed on it and broke it, but not very often. It was too small.

The Echoplex was once again mentioned in the 2022 Premier Guitar rig rundown:

In the band’s heyday, Ray traveled everywhere with his beloved Maestro Echoplex. He comments in the Rundown that while it was a key component to his sound, it was a pain to maintain with its tape cartridges and the need for a bottle of tape cleaner. Plus, in Europe power runs at 50 Hz so the unit would run slower. (The U.S. standard power is 60 Hz.)

"Eventually I switched from the Echoplex to a Lexicon PCM 42, but these days I use a Korg A3—it’s my favorite effects unit. In fact, I’ve got five of them."

Justin Trosper is noted for using the Maestro Echoplex, as mentioned on Accidentsonpurpose, where it highlights the gear he utilizes for effects processing.

Buchanan achieved his sound through minimum means. He played the Telecaster through a Fender Vibrolux amplifier with the volume and tone "full out," and used the guitar's volume and tone controls to control volume and sound15.[5][12] To achieve his desired distorted sounds, Buchanan at one point used a razor blade to slit the paper cones of the speakers in his amp, an approach also employed by the Kinks' Dave Davies. Buchanan rarely used effects pedals, though he started using an Echoplex on A Street Called Straight (1976).[5] In his later career he played with a Boss DD-2 delay.[12]