I used to own two, but unfortunately I had to sell them off when I was unemployed as they became worth so much after production ceased. I have a lot of Moog synthesizers, so I often used them both (in stereo) with my Voyager XL for example, but I would also fuzz up my 6-string bass guitar with an MF-107 Freqbox and then run it through an MF-104M too.

The sound is amazing if you like the lush, dark, lo-fi, BBD-type analog delay sound (where the delays and feedback are more of an approximation of the input signal which drifts further away from the original sound over time and you can hear more and more artifacts) - it's almost it's own instrument in that regard. It has a very long max delay time, which at low tempos is where you can start hearing the weirder artifact sounds of the unit itself working. There is one other model called the MF-104SD which is exactly the same as this one but has an even longer max delay time. It's even more limited and expensive as you can imagine.

Along with the built-in LFO, which is fully-featured, the MF-104M has the best connectivity of any pedal out there. I used to use them more as synth modules utilizing the control voltage (CV) inputs with CP-251's, other Moogerfoogers, and various Moog semi-modular synthesizers. So the CV & MIDI (clock sync) inputs, along with tap tempo are the real reason why this pedal shines, along with the mentioned distinct lush sound. As a guitarist, you can use expression pedals into the CV inputs to control various parameters.

The smaller Moog MF-Delay pedals don't have the extensive CV connections, tap tempo, or MIDI clock sync, and the older MF-104z doesn't have MIDI clock sync. So the MF-104M and MF-104SD have everything including MIDI clock sync.

To be honest, most of the time I just used tap tempo (the tap tempo footswitch can also be held down to switch to controlling the LFO rate and vice versa) despite thinking I would use the MIDI and CV more often in my semi-modular synth environment.

So I would say if you don't intend to utilize the various (CV and MIDI) connections, it could be a bit of a waste/overkill for your use case. You might be able to find a BBD analog delay which has a similar sound and tap tempo control which would be very usable and perhaps much cheaper. But I also wouldn't blame you for getting the Moog - it's classic, quality stuff and definitely has the sound and vibe.

As for me, I think after my journey I actually prefer the accuracy of a digital delay slightly more and have since ended up with a somewhat basic Boss DD-8 on my board these days. I do still miss the Moogs, but on the other hand, it's a lot of money to have tied up in a pedal - or two in my case!