For some people butter in coffee is really delicious but for some people they find the taste of butter in coffee off putting.
My Grandma used to put butter in her coffee a lot because she said it tasted good and had health benefits which it does.
I put some butter in coffee once in awhile but for me it's not that good of a taste as I prefer coffee without the butter and with creamer.
Still you might like the butter in the coffee and it is good for your health but if you use too much butter in coffee too much then it could lead to heart problems and weight gain due to the high fat content that butter contains.