When comparing Edelrid Mega Jul Sport vs Mad Rock Lifeguard, the Slant community recommends Edelrid Mega Jul Sport for most people. In the question“What are the best belay devices for rock climbing?” Edelrid Mega Jul Sport is ranked 2nd while Mad Rock Lifeguard is ranked 5th.
Specs
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Pros
Pro Assisted braking
Pro Light
Weighs only 2.3 ounces.
Pro Easy to understand for inexperienced users
It's operation is straightforward and its operation is very suitable for inexperienced users.
Pro Steel (Durable)
Pro Inexpensive
Pro More compact than a Grigri2
Pro Feeds rope to leader without special technique
Feeds slack somewhat more easily than Grigri, if the brake strand is lifted up and fed into the device (like belaying with a tube device).
Cons
Con No guide loop
Con Lowering a climber takes some practice
Con Lowering is more finicky than Grigri
Quickly transitions from "too slow" to "too fast".
Con No "lip" to grab while feeding slack quickly
While it typically feeds slack better than a Grigri, so the Grigri "fast feed" technique is not necessary, it can still sometimes get jammed. The "fast feed" Grigri technique of putting fingers under the metal lip and pressing down on the cam is not as easy to do on the Lifeguard as it is on Grigri.