What else can I say? Excellent 9/10 = Don't miss it! Meaning stop reading now and go watch it!

You really don't want to be spoiling this one, and it's better to be surprised, so you should stop reading now, and go watch it!

Let me give you a tip for when you watch it - watch it at 0.75 or 0.80 speed, so it will last longer. If you do that you will be thankful you did that, because it does 2 things. 1) It slows down how fast Sherlock is rationalizing so you can make better sense of it, and 2) it makes the whole excellent series last several hours longer and you can get more enjoyment out of it.

But ultimately, what you do is up to you, all i'm trying to tell you is don't miss this!