The Edelrid Mega Jul is a recent entrant into the field of passive assisted locking, or 'hybrid', belay devices. Its modified tube design provides considerable bite for catching lead falls and locks off by itself when your partner needs to rest. Weighing in at 2.3 oz and costing $35.95, it's also light and affordable. For these reasons we preferred it over its closest competition in passive assisted locking devices, the Mammut Smart Alpine. For all-around cragging though, our favorite remains the actively locking Petzl GriGri 2 because it has greater stopping power and smoother handling.
The Mega Jul's features could also be valued by multi-pitch climbers. However, the resistance it creates in auto-block mode is atrocious and we'd sooner use a munter hitch than subject our elbows to its abuse again. Instead, we think its usefulness is limited to dialed parties that want to pair the Mega Jul with a Black Diamond ATC Guide. With swapping, this allows both leader and follower to belay with braking assistance and when its time for rappels, there are two devices able to descend double strands.
Check out the nine other designs we tried in The Best Belay Device Review.