I have tested out a tobii eye tracker in a microsoft store and it's just very nice. There's a circle that hovers over what you are looking at and some configurable ways to "click". Tobii is probably the consumer leader in this space.

Their older trackers are perfectly functional and already did everything with perfect accuracy so them releasing newer ones that are twice the price with next to no added functionality (hand tracking? At my desk? Why?) is annoying.