Slightly off-topic, but the grapple gun doesn't really do much to assist with climbing except give the character using it the benefit of, well, assisted climbing. This is not insubstantial by any means, as it means a +2 dice pool, 1m per hit instead of 1m per 2 hits on the climbing test, and a chance to catch yourself if you glitch your climbing test. Except for the latter (arguably), Gecko Gloves do the exact same thing for more than half the price (except in the wet), and an adept can use them just as easily as a samurai.