I have purchased a set - high wind model and have just received them a few weeks ago.
Many do use them and swear they do a good job:
- Help keep cool in hot weather
- Help keep warm in cold weather
- Protects the tent from bird c**p anb tree sap
- Darkens the tent area for a better sleep (for some)
You simply need to slide them on the top as far as you can and clip them all along the edge - I tried them on for fit and it's easy.
The super high wind models has bungie cord - but I did not care for the look that much.
I am sure other will chime in with similar comments. Have a look at Hybrid Forum for more comments