Pound for pound, the longer I own/use the Super Jolly, the more I think it’s gotta be one of the best options for sub £500 grinder budgets.
I paid £175 for mine. A well used ex-commercial doser model from 2015. Added the Mazzer funnel and short hopper, a cup rest, some walnut parts from Germany and the SSP burrs. I’ve not tallied it all up but probably about £550 total. Far less if I was to skip the cosmetic upgrades.
Also the stock Mazzer burrs are incredibly good so a new set of those would be a further saving.
Of course the Major is a step up in quality but I like the proportions of the SJ on the counter.
However! Whilst it’s technically capable of brew grinding, adjusting it is going to be the biggest bottleneck. The collar is designed to be set in a commercial environment and not accidentally knocked out of place so it’s not always super easy to make fine adjustments. I definitely wouldn’t want to back and forth between brew and espresso.