I just finished watching The Sensorites. Another very good story. I liked the Sensorites, they were an interesting and reasonable race, and it kept up a solid pace. There's a lot of mystery solving in these early episodes.
I think in reality if a race was that sensitive to darkness and noise, their lives would be absolute hell.
It's no wonder they use telepathy to communicate, but their speaking voices are not too far off debilitating pain.
I believe Susan gives the first description of Gallifrey here (still unnamed at this point), which was cool, because I recall the 10th Doctor giving an almost identical description later on. A nice little callback, witnessed in reverse.
There have been at least a couple of references so far to The Doctor having only one heart, so that idea obviously came later. The Doctor's backstory isn't much developed at this point, mostly being a means to include the TARDIS as a plot device. It's interesting seeing that progress over time.
I thought the conclusion for the second elder was rushed given that he was the main bad guy of the Sensorites, but overall this was a very enjoyable story.
Flub of the story - "I heard them over....... over.... over talking......."
I think you meant "I overheard them talking" there, pal.