I bought a Skywatcher seat originally - it only lasted about 4 sessions before warping and slipping. I accidentally sat down a little too hard (seat was lower than I thought) and bent the brackets. In retrospect, the design isn't very robust.... interestingly, the product photo hides the weak points of the design.
I subsequently picked up a pre-loved Bintel seat from the classifieds here. I can highly recommend it
Its design is much, much better than the Skywatcher seat, and it folds flat within seconds. I also use it for non-astro purposes as a versatile variable-height bench.
Enjoy!