Single cup coffee makers are perfect for single people and those that just want a better cup of coffee than a normal coffee pot will allow. A single cup coffee maker gives you a higher quality cup of coffee because it was designed for just that. One premium cup of coffee. Other coffee makers will brew more at a time but they are designed for speed not quality.
Single serving coffee makers may be a bit more expensive than multi-cup coffee makers. This is because normally the only coffee you can use in them is sold in "pod" form. This is basically a self contained package that has coffee inside little flat oval shaped filters.
There are a few name brands such as Keurig, Nespresso and Mr. Coffee that you can't go wrong with, but you should definitely shop around and read some reviews and comparisons before making your purchase.
Each single cup coffee maker tends to be unique. Some will let you change the strength you desire or if you want four or eight ounces of coffee. Some will put foam or froth on top of each cup. There are many different options available to you.
Appearance is important because if your entire kitchen has stainless steel appliances, a black plastic pot might not fit the theme of the kitchen. Price is always a factor because if something will do the exact same thing for $50.00 less, you might as well give it a shot and upgrade if necessary.
The only drawback to single cup coffee makers is that they only make one cup at a time. If you have many guests, you will have to run back and forth, replace coffee pods, and make individual cups. Your guests might appreciate the higher quality, so that is a choice you will have to make.