Personally I cant justify the cost of dyneema tents,
It has been mentioned on YouTube that The notch Li is made from very thin fabric,
And care has to be taken when using it, I wonder how durable it is?
As for silnylon sagging when wet, it's no big deal to adjust the guy lines etc.
I normally check them when I need to pee in the night anyway
If these tents were sold in the UK without all the extra expense, and the price comes down as they become more popular, then maybe I will consider one in the future, however, it would need an inner suitable for the UK weather