I also have this stroller as well as a Gen7Pets Jogger and Gen7Pets Promenade. They are older but still sturdy and nice looking.The Pet Gear that Karen linked is the one that I have, also, and it is very sturdy, and stable, along with attractive and easy to fold up. Mine is about 8 years old.
Zippers close smoothly. However, I alternate strollers. So none of them gets heavy use. Possibly, with heavy use, zipper closure could be a problem. However, we have not experienced any sticking,How does the zipper work on the two Gen7Pets ones? That is the one thing that would worry me. I like the clip closure of the Petgear SOOO much better than any zipper stroller I've seen.