Sorry, I expected more learned folk than myself to happen along & elaborate.
Wynnster are a really cheap brand. Their tents are not well designed, and made of cheap material. They tend to be unnecessarily complicated to erect, and flimsy when up. They don't sustain weather well, with the poles often not up to wind (that's as much a fault of the pole designs as the poles themselves, which are poor quality aluminium tubes, too narrow for stiffness. I've seen a tent destroyed with bent tubes in a wind that was barely bothering expensive tents.
The cover material being cheap has a few consequences. Firstly, they won't stand up to wear, and will start to fray and tear quickly. Secondly, they are susceptible to leaks, which is a real Bad Thing in my book, that can turn a snug night under canvas into a cold and wet nightmare. Thirdly, it may stretch, leading to noisy flapping.
Stitching is of a low quality, and often unfinished, so it does unravel. Guylines are OK, but a bit weedy and prone to stretching. As for pegs, I have seen one new out of the bag without enough.
Yes, I know that you should always check before going to camp, but a lot of buyers of this sort of tent won't have the experience to do that. That's how I know these so well - I've had to help people put them up, and I've been defeated in my attempts to get it straight & properly tensioned.
All in all, a very poor option, that you are unlikely to enjoy.
Having said that, someone will be along in a minute to tell of how their Wynnster is erected in moments, sturdy, and has lasted them through gales for many years.
I'm not saying that you get what you pay for with tents. To a certain extent, that's true, but there are bargains to be had.
These aren't them.