I do, and I thought this episode was abysmal. No offense to anyone who liked it, but in my opinion, this was the worst Sherlock episode by far, and it came to the point when I seriously considered just turning it off. This is the first Sherlock episode I kind of regret wasting my time on. This stuff with different rooms and experiments in the middle was ridiculous, it's like I watched Saw or played Portal or whatever, and it was also contrived as hell. Definitely not something I want to see in this show.
I won't even go to details, since I'm frustrated a bit too much that one of my favourite shows turned into such a disaster, but I will probably read the feedback and reviews for S5 (if it ever happens) before watching it.
(It also doesn't help that I have to stay up until 2 A.M. to finish the episode, and I have to get up at 5 A.M., so I'm feeling even worse about time wasted on watching this episode.)