As far as being single or just a couple with a few devices, a modem/router combo or gateway should work out nicely. In my household, we have 5 people and about 12-14 devices connected at any given time. This includes phones, tablets, desktop PCs, a laptop and gaming consoles. If your household is like mine, having a gateway is not a wise choice. The reason for this is that your connection and/or equipment might need some minor maintenance (which is easier to troubleshoot/fix when separate) and built-in routers are extremely lacking in features. Also, if you're like me, the router end of the equation can only ever be updated by your ISP if it's contained within your modem. I had bought a Motorola SBG6580 and ended up disabling the internal router and purchased an Asus RT-AC3200 because of this. I may have dished out over $300 in just equipment but this equipment won't need replacing until gigabit internet rolls out. Also, I can update the firmware (internal software) with updates from Asus. If you're considering a gateway vs a separate modem and router, please consider these points.