Having options is great. I do tend to use the single serve side most of the time. I like the choice of making “strong” or “regular” brew on either side of the coffeemaker. I had read prior reviews stating that it takes so long to brew. If you have it set to “strong” it will take longer. 
I do have a couple cons…… Because this is a larger unit, it’s a little awkward to move. I have it on the counter under a cabinet. In order to fill the water for the carafe side you must pull it all the way out. This may not be a big deal to most. But when I have the single serve water tank filled it can be a little heavy. Also, when using the single serve side, a lot of steam comes out of the carafe water tank area. The first time I used it it actually scared me. It’s best to have it pulled out from under a cabinet because of all the steam.