This is my favourite Costco in Ontario. It's generally less hectic inside than the Woodbine/Hwy 7 and Markham/14th Ave locations, and MUCH better in every aspect than the Warden/Ellesmere location. It's a newer location with the typical Costco layout. The product selection is pretty good and the produce is fresh.
Costco has legendary customer service, and I've never been less than satisfied with the service at this location when dealing with Costco employees. In particular, I love the optical department because of their policies with contact lenses. I always have unopened boxes after getting a new prescription and I have never had a problem with changing prescriptions, even after the lenses are approaching the expiration date. The food sample workers are often slow (or maybe us Richmond Hill-ers are just overeager to line up for samples), but whatever, it's free! On my days off, I sometimes come here during the afternoons when there are many samples so I don't have to make lunch.
The cash register lineups can get long, but they move quickly and do not compare to the absolute zoo that the Warden location almost always is. The only thing that I'd really love to see at this location is a gas station. However, the parking lot is crazy as it is, so that might not be the best idea.