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I don't have experience with the Gaggia MDF but I've used a Eurika Mignon quite a lot and from watching a youtube video they looks very similar in performance. It's possible to get grinders with some extra features like the Rocket Fausto but I honestly don't think it's worth buying anything more expensive than those for home use, they'll both happily do espresso grind, the areas they fall down is things like the quality of the adjustment system and heat dissipation if using continuously.
The next real step up would be something like a Mazzer Super Jolly, which costs about £1k or just under, which you could definitely use in a commercial set up, just not constantly mainly because of the heat build up, but would be overkill for home use.
Above that are grinders with much larger and better blades, way better adjustment, consistency, and deals better with heat build up. Ones like the Mahlkonig Peak, but you're looking at about £2k and only worth while in a high volume commercial setting.
Out of interest when was the last time you took your MDF apart and cleaned the blades? If it's been a while then try your hand at that because it'll help with grind consistency.
Sumo-
I took it apart about 12m ago when I serviced the classic. Prior to that I’d not done anything to it since I bought it from @Clever_Pun 6 years prior.
Cornish_Bike
Happy yes, but WFH has caused me to suffer from upgradeitas. TBH I thing my money would be better spent on the PiD for the Classic rather than a grinder. Just interested for future reference.
Out of interest what would the next step be ? It’s quite scary how you can go from a £3-500 machine / grinder to £1k plus....