The Edelrid Eddy has been around for awhile but has yet to gain much popularity. Although it may look like the Editors' Choice Petzl GriGri 2, it weighs twice as much and costs more. The Eddy does have a few benefits, however, it's smoother with thick ropes (>10.0mm), more durable, and features an anti-panic lowering mechanism. This mechanism stops the rope if the belayer pulls the handle too hard or loses control during descent. For these reasons it's one of our favorite devices for pure top-roping. At one time the Eddy would have been our recommendation for safety-minded climbers. However, the Camp Matik came out recently and is now our favorite in that respect.
You can check out the nine other designs we tested in The Best Belay Device Review.