I’ve got a Dualit 75015. Off the shelf its quite good for most coffees, though its just a bit too coarse for expressos. I had to do a mod to get a finer grind. I can only compare it to my previous blade grinder and the pre-ground stuff you get in the shops, but its definitely better.
Yeah I’ve done exactly this and I’m definitely happier post-modification. However I still can’t get a really fine grind – if I set the burrs any closer then the machine just grinds metal-on-metal. I don’t think the tolerances are there to create a truly espresso-grade grind. So I wouldn’t recommend this.
Hand grinders sounds inconvenient enough that I probably wouldn’t use them every day.
Ignore anyone who suggests blade grinders. You’ll get better results with months-old pre-ground stuff, especially if you buy decent beans with an appropriately fine grind.
Brewing coffee is one of those things where the naive beginner often thinks they know better than the advice being doled out. E.g. when you’re buying a snowboard, you should spend the most on the boots (yeah right, I just want the cool board with the sick graphics), and with an SLR camera you should spend more on lenses than the body, or a decent hardtail is far better than a cheap Argos BSO full sus.
AND it’s far more important to put money into a grinder than spending on a shiny pretty espresso machine.