Eufy RobotVac 11s review: Our favorite budget robot vacuum gets an upgrade

We couldn't imagine there was much room to improve the Eufy RoboVac 11 when we selected it as our favorite budget robot vacuum. It was one of the simplest, smallest, and most affordable models available. The 11s has the same black finish and tempered-glass top as its predecessor, but it's slightly smaller: It's been scaled down to 12.8 inches in diameter and 2.8 inches in height from the 13-by-3-inch original. That's one of the slimmest profiles we've seen in a robot vacuum, rendering it it ideal for getting under low-clearance couches, coffee tables, and other furniture. Like the RoboVac 11, the new 11s doesn't use any sophisticated mapping technology to navigate.