Guitar amps · owner-verdict comparison

Boss Katana 50 Gen 3 vs Positive Grid Spark 40: what real owners say

Real owners lean toward the Boss Katana 50 Gen 3: 65% of 625 owners recommend it, vs 54% of 52 for the Positive Grid Spark 40.

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

Boss Katana 50 Gen 3

65%of 625 owners recommend

65% recommend · 15% neutral · 20% don't

Owners praise

Incredible value and bang for the buck
Great tones across cleans and amp models
Huge range of built-in effects covers what you'd buy as pedals

Owners complain about

Default and out-of-box tones can underwhelm until dialed in
Editing and deep menu interface is unintuitive
Can sound processed compared to a real tube amp

Full owner report →

Positive Grid Spark 40

54%of 52 owners recommend

54% recommend · 4% neutral · 42% don't

Owners praise

Excellent value practice amp
Huge tone variety via app
Fun for jamming and learning songs

Owners complain about

Reliability issues, hiss or cutout
Not loud enough to gig
Thin, digital sound versus tube amps

Full owner report →

What Boss Katana 50 Gen 3 owners say

“This amp is a no brainer. Cheap and delivering a great sound and loaded with features.”
— @088Noir on YouTube

“Told my parents i wanted world peace for christams, but if i couldn't get that, Id want the amp instead lol”
— @jakerobertson5198 on YouTube

“now it has a wool blanket thrown over it”
— @ReductioAdAbsurdum on YouTube

What Positive Grid Spark 40 owners say

“What I love most about Spark is when I want to learn a song, I search the cloud for the song.”
— @jrigwald on YouTube

“The best practice amp I have ever owned. Full stop.”
— @l-Libertine on YouTube

“The first built-in practise pattern I tried has got wrong chord positions in the grid - pretty much useless for a beginner, who *depends* on the practise material to be _correct._”
— @Noone-of-your-Business on YouTube