What a perfect solution! I always have a stick of butter in the butter dish on the counter. It is always nice and soft, ready to slather on our morning waffles, muffins, or even sandwich bread. And for those of you wondering: no, the butter doesn't go bad on the counter! Admittedly, a stick of butter never lasts us more than a week, but I know others who have left it out for over a week with no problem.
I do not use one of those fancy butter keepers that have water in them, just a plain butter dish. My butter dish happens to be metal, but glass is fine, too. I like to leave the butter stick in its wrapper, so that I don't have to clean the butter dish very often. But I know plenty of others who go ahead and place the stick of butter directly on the butter dish.
A couple cautions:
1. If you buy RAW butter, I would not recommend leaving it out on the counter. If you do, it will develop a much stronger, almost cheesy flavor over time. This is because the live enzymes in the raw butter are still working just as they would in making raw milk clabber on the counter.
2. If it is very hot in your house in the summer months, then your butter might melt and make a big mess. This won't be a problem unless it gets upwards of 90 degrees in your house.