I was lucky to experience a valley on Mandrill on Sunday, we just came to a stop at the boost launch area before the helix. I found it quite exciting as we would have to experience the rides swing launch to get it going again. I really enjoyed it as well. Mandrills launches are quite punchy as it is so going back and forth through the section was pretty satisfying.
I am actually quite a big fan of Mandrill tbh, I've heard all the arguments about it being the wrong fit and whatever, however every time I go on it, it gives me a lot of joy and the queues for it never seem crazily unreasonable.The team always seem really on it when it comes to batching, loading and dispatching. It also has the B&M quirk of being incredibly reliable, 3.8% downtime for the last 7 days, and beaten only by Nemesis Reborn.