I’ve ran a Mystery Ranch Metcalf with the Guide LT frame for years. Pack has served me well. Only complaint is I don’t necessarily like the access into the main bag. I don’t really need a new pack, I’ve been looking at the Initial Ascent and EXO pack. Look like great packs and good reviews. But $700+ is steep. Those who have upgraded to one OD these packs, particularly those coming from a Mystery Ranch pack. Was it worth it?