As far as coffee obsession goes I like to take it to the next level and I buy Green coffee beans from Sweet marias website and have a small home roaster. I roast all my own coffee and yes, there is a difference. The reason coffee tastes bitter is because it is stale and coffee starts becoming stale in days after the beans are roasted - in hours after they are ground. If you do not know the roast date you are most likely drinking stale coffee and if the beans you are grinding ar oily(have a greasy shine)they are burnt - this preserves flavor longer but is not the best flavor by far that the bean could offer. Also, there are some great coffees from all around the world and most are surprised how many great flavor profiles come out of a great cup of coffee. My favorites are Central American coffees for the chocolate overtones but lately I am into African beans that have a very bright, fruity profile. Fresh roasted coffees are very much like good wine and every bean and every year can offer different profiles with some better than others. The only big difference is time - coffee does not get better with time like many wines do.
Bow hunting and great coffee - not much better in my world!
Bob Urban