Barb and Zack,
Welcome to MySwag, hope you enjoy the forum. You might have opened a can of worms as no doubt there will be lots of different opinions.
We have an Austrack tent which is ripstop on our camper,
http://www.austrackcampers.com.au/ and I can honestly say we`ve never had a problem with it. Our camper has had a lot of use in the 2 years that we`ve had it including in torrential rain and more recently in a mini cyclone, during which others were damaged. It has never leaked, nor ripped but has faded a bit.
In saying this I would think there are different qualities available as a lot of the ripstop tents now advertised are less than half the price of the Austrack. I have seen lesser quality ones at Camping Shows.
Cheers, Robyn.