Assembly of the frame and clipping the carrier into the frame are both very easy and intuitive! I used it for the first time today and it took me just a few seconds and we were ready to go! The design is super intuitive and everything is easy to use.I had the standard soft carriers before these and my cats would run away whenever they saw them. They only have enough room for the cats to lie down in them, which isn't comfortable.By contrast, I set both of these new carriers out a couple of weeks ago and they both like to sleep in them! They have enough room to comfortably sit and curl up in whatever position they want, which helps make vet visits and car rides way less stressful. I took Mouse to the vet today and even though she hates the vet, the entire visit went much more smoothly than usual because of the new carrier. The vet was able to get her in and out easily, and even do her checkup while she was inside the carrier because it is so roomy and has an open design. When we got back from her appointment, Mouse took a nap in the carrier. She is usually very stressed after the vet and will hide in the closet for about an hour, but she was her usual self after about 10 minutes this time. Truly, this is the best carrier out there.The only thing I would say is a "negative" is that this carrier is a bit heavier than a standard carrier, and a little more bulky, so carrying it around is a little inconvenient, but honestly it's not a big deal at all. Considering the significant stress reduction for us band also the increased car safety and ease of use, I'd say it's more than worth it! If you aren't sure about buying this, or if you have a pet who gets stressed out by being in a carrier, I'd say definitely do it. The materials are high quality and it's durable and will last a lifetime.