i fucking hate soloing w/ a gri - i call it the grigrimonster, and it must be feed often or it will have it's revenge - that said, it does work (though sometimes it looks godawful fucked up after you take a fall on it) and is very versatile for also belaying, jugging, hauling and short-fixing - if i win the lottery someday maybe i'll try onna ya'lls fancy devices