It was a great episode, I actually really liked Smith and love his new companion for obvious reasons, however...
...I know Moffat really likes his 'fear through repetition' thing, and it's obviously something he can do really, really well (The 'are you my mummy?'/ 'Don't blink' episodes he did being excellent examples of him doing it right) but whatever the hell that eyeball guard thing kept announcing over and over again really fucking annoyed me rather than unnerved me like the usual. I couldn't even quite make out what it was he was saying.