5/5 been using it for 40 hours or so to gain 90 str.
It does very well in prayer flicking, and dodging the falling stones from the ceiling. I started at 60 att/str and it was having the time of its life killing the boss and its minions.
Once you get a bone weapon it absolutely wrecks anything in its path. The only thing I've noticed is that when you're using mage/range weapons, it will not as often dodge the falling rocks, and you'd take some damage, but that is about it.
I'd love to see a setting to what to spend spines on as a dropdown where you can choose which reward to pick from, its a niche setting, but would be awesome to see in action.