>I've not been a part of but I've heard of horrors like SAFe. I've seen the diagrams [0] and I can't believe someone was sold on that.
the diagram is an eye candy for a mid-level executive. Upon seeing it, they start dripping saliva and become weak in the knees. The diagram has Lean, Agile and while it is missing the word Scrum it obviously is depicted there too. I've been through couple of years of the process looking extremely similar to that diagram (though word "SAFe" wasn't there) implemented across whole R&D (only super important projects got exception) of a pretty BigCo. Well, it was beyond horror. The product development was basically stalled completely. The gears were churning with lightning speed, people were constantly overworked, rushing to meet multitude of deadlines, .... all that while product just wasn't moving forward. No meaningful features could be delivered. It is hard to believe until you see it with your own eyes.
Then, one nice morning, all the mentioning of it just disappeared, like it never happened, and we're back to happily cranking out according to current release plans with weekly team meetings.