This may come a bit late. Bt may help others in the future..
There are coffee grinders and there are coffee grinders.
You need to know what you want before you see or buy.
Firstly there are ones that have blade in it and it chops the beans into bits. It can also be used for hacking into bits spices.
If you care about taste - both in spices, cofefe (lol) or anything food - you want to stay away from these.
These are blade grinders
Next is the Burr Grinders. When you want the best coffee. You want the beans to be mashed down to release the full flavour and oil from the coffee. The burr grinder does this by mashing the beans between two teeth made of metal. Then there are some different Burr grinders, etc.
The Grinder is one of the 5 or 6 key steps to coffee nirvana. A serious coffee aficionado may buy at least a Eureka Mignon grinder. Then move sideways or upwards. There are handheld ones that does similar actions too.