I was looking at this recently and bought a lanshan 1 pro.
Not used it in anger yet.
Pros seem to be
– well built/good quality
-almost as light as you can go, bivvy bag excluded
– lots of room inside and in the porch
– the brown colour is ace
Cons
– need a good pitch, peg placement is finicky
– need a pole (not really much of a negative)
– need to seam seal (not really much of a negative)
The reason why they don’t seem seal them in the factory is that it isn’t economically viable. You’d have to leave loads of tents pitched for hours and hours somewhere dry (huge warehouse), the man power to do it etc. it’s not possible to seam seal silnylon with tape.
I’m unsure about condensation and reliability at this point as not used it yet