Like yours, a strong resemblance visually/morphologically to the mother.
When it was growing, it was very fumey/gassy with a "dark", dank smell up close that I found very hard to describe. It invoked quite a visceral response from me the first few times. "Death" smells. Like really old garbage juice as opposed to fresh, lol.
After the cure, in a joint, it gives me a kushy, gassy, dryer sheet base flavour, with a slight "chemmy" twist/funk on top, which is ultimately what sets it apart from my TK S1s, which otherwise I did find quite similar in "base flavour".
The flavour also persists throughout the smoke/joint, whereas with the TK S1s it doesn't taste as good further along.
Effects-wise, quite well-rounded! I find the TK S1s to be very stoney without much of a headbuzz. My 91 S1 puts me in a really good place, both head and body, is fucking strong, and I don't have the desire to smoke anything else for a solid couple of hours.