Guitar Pedals · owner-verdict comparison

Holy Grail Nano Reverb vs MXR Carbon Copy: what real owners say

Real owners lean toward the MXR Carbon Copy: 71% of 31 owners recommend it, vs 60% of 15 for the Holy Grail Nano Reverb.

Verdicts aggregated from Reddit, enthusiast forums, and YouTube owner comments — affiliate reviews excluded. Sample sizes differ; judge accordingly. How we score

Holy Grail Nano Reverb

60%of 15 owners recommend

60% recommend · 7% neutral · 33% don't

Owners praise

One knob and nothing to set up, which is the strength owners name most often
Works as an always-on reverb that gets set once and left alone
Spring mode is the sound owners single out as getting it right

Owners complain about

Limited range, with none of the long trails or ambient washes some players expect from a reverb
Plain next to modern reverbs, and several owners went back to pedals they already owned

Full owner report →

MXR Carbon Copy

71%of 31 owners recommend

71% recommend · 13% neutral · 16% don't

Owners praise

Warm, natural-sounding analog delay tone that owners rank among the best analog delays available
Long-term reliability and loyalty, owners keep it for a decade or more, tour heavily with it, and keep returning to it after trying other delays
Underwhelming compared to alternatives for a minority of owners, some felt it didn't outperform other delays (like the analog settings on an FB/FB4) and ended up returning or replacing it

Owners complain about

Underwhelming compared to alternatives for a minority of owners, some felt it didn't outperform other delays (like the analog settings on an FB/FB4) and ended up returning or replacing it

Full owner report →

Which should you buy?

Get the Holy Grail Nano Reverb if

✓Players who want one reverb parked on the board and never touched again
✓Small combo amps with no reverb tank of their own
✓A first pedal, where one control beats a menu
✓Boards where a spring flavour is the goal rather than ambient texture

Skip it if

Players chasing long trails, shimmer, or washed-out ambient sounds
Anyone who wants control over decay, tone, or mix beyond a single amount knob

Get the MXR Carbon Copy if

✓Players wanting warm, natural analog delay
✓Guitarists after slapback and short echo settings
✓Ambient players needing swells that preserve the dry signal
✓Beginners who want simple, hands-on controls

Skip it if

Players needing versatility beyond one analog sound
Those wanting very long delay times

What Holy Grail Nano Reverb owners say

“I have the nano but same... Spring always on. It was my first pedal and I don't think I've ever turned it off!”
— dnlprn86 on Reddit

“Great simple reverb. If you’re looking for huge trails, etc. it’s not what you’re after but if you want an easy set and forget, solid sounding reverb it’s still hard to beat, especially for the used price.”
— Palomar_Sound on Reddit

“good but quite plain isn't it and there are so many other pedals that cover this sound entirely plus more, dunno why someone would get this where there's so much better available.”
— Thereminz on Reddit

What MXR Carbon Copy owners say

“Easily my favourite delay pedal!”
— @thejosebatista on YouTube

“Love the CarbonCopy.”
— @northof50now on YouTube

“j'ai acheté cet effet c'est loin d'être ça !”
— @francoisb4830 on YouTube

Holy Grail Nano Reverb vs MXR Carbon Copy: frequently asked questions

Is the Holy Grail Nano Reverb or the MXR Carbon Copy better?

Real owners lean toward the MXR Carbon Copy: 71% of 31 owners recommend it, vs 60% of 15 for the Holy Grail Nano Reverb.

Who should get the Holy Grail Nano Reverb?

Owners point the Holy Grail Nano Reverb at players who want one reverb parked on the board and never touched again, and small combo amps with no reverb tank of their own.

Who should get the MXR Carbon Copy?

Owners point the MXR Carbon Copy at players wanting warm, natural analog delay, and guitarists after slapback and short echo settings.

What do owners complain about?

The most-cited downside of the Holy Grail Nano Reverb is limited range, with none of the long trails or ambient washes some players expect from a reverb. For the MXR Carbon Copy, it's underwhelming compared to alternatives for a minority of owners, some felt it didn't outperform other delays (like the analog settings on an FB/FB4) and ended up returning or replacing it.