Hi there!
Just wanted to share some of my experiences with the GX-100, and by doing so, complain about the industry's failure to make the perfect device (well perfect for me)

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I bought the GX-100 used in end of 2022, and it was supposed to be a substitute of my trusty G-Lab GSC-2 plus pedals (modulation, delay, reverb), was supposed to simply sit in front of my Fryette clone amps, so I'd only use it as pure FX device, amp switcher and foot controler.The GX-100 my first and only such device - so no comparison to similar devices.
With that said, I really like the UI, the form factor and the FX sounds by themselves.
However, I was disappointed of its noise floor, so I went for 4CM using its noise gate in loop, which works ok for me, but I hate that I hear the gate working, I simply don't want to use a gate. And I hate the fact that I need to do all the cabling hazzle.
Also there is a slight change in sound when in the signal chain, which I can tolerate, but once I noticed it, it's annoying.
Since I recently left the band project, it was mainly intended for, I put it away and built a VERY simple setup using a few boss pedals, a FS5L foot switch for amp switching, and a DIY relay based bypass looper with only ONE loop (based on a PCB of THC FX), to be ably to true bypass all the pedals for my main dry tones.
I tried several power supplies, and the one, which really works absolutely perfect, is the BOSS PSA-230S. I use this one and simply daisychain everything, and it's DEAD quiet. Amazing.
However, tap dancing starts to begin, and back I was in the neverending search for the perfect FX device for me, which would be the MS-3, but with three relay based loops, relay-bypassable internal multi-effects block for some bread&butter delays and reverbs, the UI as a a mix of the UI's of the GX 100 (for assigns and all the configuring of of settings and presets and stuff) and the ME-90 (for effetcs parameters), and finally the discrete buffer of the TU-3......
Since this device doesn't exist, I thought, before buying something new with a compromise, I might as well use the GX-100, put it in the loop of my simple relay loop switcher (to get rid of the hiss/noise, when playing dry amp sounds, which is about 70% of the time...), put a simple buffer in front, and let the amp ctrl function of the GX-100 do amp and looper switching, AND power all this via the GX-100's supply.
This works quite well, but only if I put a Joyo ZGP noise blocker before the 9V input of the relay looper, I suspect a ground loop.
BUT the GX-100 supply still is noisy. I wonder why I haven't noticed that earlier, since it doesn't change, when I only use the GX-100 by itself in front of an amp. It's somewhere in the 500...800 Hz region, that comes through the hiss.
So I just tried the small PSA 230S supply in the same setup and it works, the 500Hz component is gone!
BUT the supply gets quite warm and the voltage drops from around 9.4 V idling, to around 8.6 V, when the GX-100 is in use. All this is at room temperature. Will have to test this for a longer time than just 30 minutes.
Maybe I could also go the powerbank route, may someday try the Harley Benton Powerplant powerbank, which is said to work with the GT1000 Core.
But still, all this requires a quite complex cabling, the programming gets a little more complex too, because of the need to switch the bypass looper on, everytime I need a delay or phaser.
I could use a MS-3, put my most critical pedals in its loops, put all this in the relay loop switcher to have true bypass dry sound - but I can't imagine programming this setup without a laptop, and the cabling still is complex.
I was also considering the tc Plethora, but it is neither a foot controler, nor does it amp switching.
So the bottom line:
1. the GX-100 i quite ok, but not perfect (for me)
2. the perfect device (for me) doesn't exist
3. try the PSA 230S !!! It's REALLY quiet, simply fantastic (maybe not for the GX-100)
Cheers!