Wife bought some whole bean coffee by mistake a while back. She was going to throw it away. I just ordered a grinder off Amazon. Turns out it’s noticeably better than the pre-ground stuff.
Yep, I'm a convert too.
A local company had a deal where you could buy their ceramic burr coffee bean grinder and use it for a month.
If you didn't think it made better coffee, you could return it and get all of your money back - and they paid the return shipping.
I brought the grinder, fully expecting to send it back.
I bought exactly the same beans as the ground coffee I usually bought, Lavazza Espresso Barista Gran Crema.
The difference was noticeable and I kept the grinder.
The grinder is bloody noisy and a bit of shock first thing in the morning, but I put up with that because the coffee tastes and
smells better.
John